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e0c1b49f5b
Upgrade to the latest upstream zstd version 1.4.10. This patch is 100% generated from upstream zstd commit 20821a46f412 [0]. This patch is very large because it is transitioning from the custom kernel zstd to using upstream directly. The new zstd follows upstreams file structure which is different. Future update patches will be much smaller because they will only contain the changes from one upstream zstd release. As an aid for review I've created a commit [1] that shows the diff between upstream zstd as-is (which doesn't compile), and the zstd code imported in this patch. The verion of zstd in this patch is generated from upstream with changes applied by automation to replace upstreams libc dependencies, remove unnecessary portability macros, replace `/**` comments with `/*` comments, and use the kernel's xxhash instead of bundling it. The benefits of this patch are as follows: 1. Using upstream directly with automated script to generate kernel code. This allows us to update the kernel every upstream release, so the kernel gets the latest bug fixes and performance improvements, and doesn't get 3 years out of date again. The automation and the translated code are tested every upstream commit to ensure it continues to work. 2. Upgrades from a custom zstd based on 1.3.1 to 1.4.10, getting 3 years of performance improvements and bug fixes. On x86_64 I've measured 15% faster BtrFS and SquashFS decompression+read speeds, 35% faster kernel decompression, and 30% faster ZRAM decompression+read speeds. 3. Zstd-1.4.10 supports negative compression levels, which allow zstd to match or subsume lzo's performance. 4. Maintains the same kernel-specific wrapper API, so no callers have to be modified with zstd version updates. One concern that was brought up was stack usage. Upstream zstd had already removed most of its heavy stack usage functions, but I just removed the last functions that allocate arrays on the stack. I've measured the high water mark for both compression and decompression before and after this patch. Decompression is approximately neutral, using about 1.2KB of stack space. Compression levels up to 3 regressed from 1.4KB -> 1.6KB, and higher compression levels regressed from 1.5KB -> 2KB. We've added unit tests upstream to prevent further regression. I believe that this is a reasonable increase, and if it does end up causing problems, this commit can be cleanly reverted, because it only touches zstd. I chose the bulk update instead of replaying upstream commits because there have been ~3500 upstream commits since the 1.3.1 release, zstd wasn't ready to be used in the kernel as-is before a month ago, and not all upstream zstd commits build. The bulk update preserves bisectablity because bugs can be bisected to the zstd version update. At that point the update can be reverted, and we can work with upstream to find and fix the bug. Note that upstream zstd release 1.4.10 doesn't exist yet. I have cut a staging branch at 20821a46f412 [0] and will apply any changes requested to the staging branch. Once we're ready to merge this update I will cut a zstd release at the commit we merge, so we have a known zstd release in the kernel. The implementation of the kernel API is contained in zstd_compress_module.c and zstd_decompress_module.c. [0]20821a46f4
[1]e0fa481d0e
Signed-off-by: Nick Terrell <terrelln@fb.com> Tested By: Paul Jones <paul@pauljones.id.au> Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM/Clang v13.0.0 on x86-64 Tested-by: Jean-Denis Girard <jd.girard@sysnux.pf>
483 lines
16 KiB
C
483 lines
16 KiB
C
/*
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* Copyright (c) Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#ifndef ZSTD_CWKSP_H
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#define ZSTD_CWKSP_H
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/*-*************************************
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* Dependencies
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***************************************/
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#include "../common/zstd_internal.h"
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/*-*************************************
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* Constants
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***************************************/
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/* Since the workspace is effectively its own little malloc implementation /
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* arena, when we run under ASAN, we should similarly insert redzones between
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* each internal element of the workspace, so ASAN will catch overruns that
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* reach outside an object but that stay inside the workspace.
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*
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* This defines the size of that redzone.
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*/
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#ifndef ZSTD_CWKSP_ASAN_REDZONE_SIZE
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#define ZSTD_CWKSP_ASAN_REDZONE_SIZE 128
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#endif
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/*-*************************************
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* Structures
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***************************************/
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typedef enum {
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ZSTD_cwksp_alloc_objects,
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ZSTD_cwksp_alloc_buffers,
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ZSTD_cwksp_alloc_aligned
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} ZSTD_cwksp_alloc_phase_e;
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/*
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* Used to describe whether the workspace is statically allocated (and will not
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* necessarily ever be freed), or if it's dynamically allocated and we can
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* expect a well-formed caller to free this.
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*/
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typedef enum {
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ZSTD_cwksp_dynamic_alloc,
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ZSTD_cwksp_static_alloc
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} ZSTD_cwksp_static_alloc_e;
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/*
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* Zstd fits all its internal datastructures into a single continuous buffer,
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* so that it only needs to perform a single OS allocation (or so that a buffer
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* can be provided to it and it can perform no allocations at all). This buffer
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* is called the workspace.
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*
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* Several optimizations complicate that process of allocating memory ranges
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* from this workspace for each internal datastructure:
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*
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* - These different internal datastructures have different setup requirements:
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*
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* - The static objects need to be cleared once and can then be trivially
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* reused for each compression.
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*
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* - Various buffers don't need to be initialized at all--they are always
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* written into before they're read.
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*
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* - The matchstate tables have a unique requirement that they don't need
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* their memory to be totally cleared, but they do need the memory to have
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* some bound, i.e., a guarantee that all values in the memory they've been
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* allocated is less than some maximum value (which is the starting value
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* for the indices that they will then use for compression). When this
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* guarantee is provided to them, they can use the memory without any setup
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* work. When it can't, they have to clear the area.
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*
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* - These buffers also have different alignment requirements.
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*
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* - We would like to reuse the objects in the workspace for multiple
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* compressions without having to perform any expensive reallocation or
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* reinitialization work.
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*
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* - We would like to be able to efficiently reuse the workspace across
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* multiple compressions **even when the compression parameters change** and
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* we need to resize some of the objects (where possible).
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*
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* To attempt to manage this buffer, given these constraints, the ZSTD_cwksp
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* abstraction was created. It works as follows:
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*
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* Workspace Layout:
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*
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* [ ... workspace ... ]
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* [objects][tables ... ->] free space [<- ... aligned][<- ... buffers]
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*
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* The various objects that live in the workspace are divided into the
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* following categories, and are allocated separately:
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*
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* - Static objects: this is optionally the enclosing ZSTD_CCtx or ZSTD_CDict,
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* so that literally everything fits in a single buffer. Note: if present,
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* this must be the first object in the workspace, since ZSTD_customFree{CCtx,
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* CDict}() rely on a pointer comparison to see whether one or two frees are
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* required.
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*
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* - Fixed size objects: these are fixed-size, fixed-count objects that are
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* nonetheless "dynamically" allocated in the workspace so that we can
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* control how they're initialized separately from the broader ZSTD_CCtx.
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* Examples:
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* - Entropy Workspace
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* - 2 x ZSTD_compressedBlockState_t
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* - CDict dictionary contents
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*
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* - Tables: these are any of several different datastructures (hash tables,
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* chain tables, binary trees) that all respect a common format: they are
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* uint32_t arrays, all of whose values are between 0 and (nextSrc - base).
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* Their sizes depend on the cparams.
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*
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* - Aligned: these buffers are used for various purposes that require 4 byte
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* alignment, but don't require any initialization before they're used.
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*
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* - Buffers: these buffers are used for various purposes that don't require
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* any alignment or initialization before they're used. This means they can
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* be moved around at no cost for a new compression.
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*
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* Allocating Memory:
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*
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* The various types of objects must be allocated in order, so they can be
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* correctly packed into the workspace buffer. That order is:
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*
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* 1. Objects
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* 2. Buffers
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* 3. Aligned
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* 4. Tables
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*
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* Attempts to reserve objects of different types out of order will fail.
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*/
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typedef struct {
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void* workspace;
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void* workspaceEnd;
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void* objectEnd;
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void* tableEnd;
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void* tableValidEnd;
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void* allocStart;
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BYTE allocFailed;
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int workspaceOversizedDuration;
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ZSTD_cwksp_alloc_phase_e phase;
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ZSTD_cwksp_static_alloc_e isStatic;
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} ZSTD_cwksp;
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/*-*************************************
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* Functions
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***************************************/
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MEM_STATIC size_t ZSTD_cwksp_available_space(ZSTD_cwksp* ws);
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MEM_STATIC void ZSTD_cwksp_assert_internal_consistency(ZSTD_cwksp* ws) {
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(void)ws;
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assert(ws->workspace <= ws->objectEnd);
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assert(ws->objectEnd <= ws->tableEnd);
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assert(ws->objectEnd <= ws->tableValidEnd);
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assert(ws->tableEnd <= ws->allocStart);
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assert(ws->tableValidEnd <= ws->allocStart);
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assert(ws->allocStart <= ws->workspaceEnd);
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}
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/*
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* Align must be a power of 2.
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*/
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MEM_STATIC size_t ZSTD_cwksp_align(size_t size, size_t const align) {
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size_t const mask = align - 1;
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assert((align & mask) == 0);
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return (size + mask) & ~mask;
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}
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/*
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* Use this to determine how much space in the workspace we will consume to
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* allocate this object. (Normally it should be exactly the size of the object,
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* but under special conditions, like ASAN, where we pad each object, it might
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* be larger.)
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*
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* Since tables aren't currently redzoned, you don't need to call through this
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* to figure out how much space you need for the matchState tables. Everything
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* else is though.
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*/
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MEM_STATIC size_t ZSTD_cwksp_alloc_size(size_t size) {
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if (size == 0)
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return 0;
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return size;
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}
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MEM_STATIC void ZSTD_cwksp_internal_advance_phase(
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ZSTD_cwksp* ws, ZSTD_cwksp_alloc_phase_e phase) {
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assert(phase >= ws->phase);
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if (phase > ws->phase) {
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if (ws->phase < ZSTD_cwksp_alloc_buffers &&
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phase >= ZSTD_cwksp_alloc_buffers) {
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ws->tableValidEnd = ws->objectEnd;
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}
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if (ws->phase < ZSTD_cwksp_alloc_aligned &&
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phase >= ZSTD_cwksp_alloc_aligned) {
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/* If unaligned allocations down from a too-large top have left us
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* unaligned, we need to realign our alloc ptr. Technically, this
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* can consume space that is unaccounted for in the neededSpace
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* calculation. However, I believe this can only happen when the
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* workspace is too large, and specifically when it is too large
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* by a larger margin than the space that will be consumed. */
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/* TODO: cleaner, compiler warning friendly way to do this??? */
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ws->allocStart = (BYTE*)ws->allocStart - ((size_t)ws->allocStart & (sizeof(U32)-1));
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if (ws->allocStart < ws->tableValidEnd) {
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ws->tableValidEnd = ws->allocStart;
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}
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}
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ws->phase = phase;
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}
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}
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/*
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* Returns whether this object/buffer/etc was allocated in this workspace.
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*/
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MEM_STATIC int ZSTD_cwksp_owns_buffer(const ZSTD_cwksp* ws, const void* ptr) {
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return (ptr != NULL) && (ws->workspace <= ptr) && (ptr <= ws->workspaceEnd);
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}
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/*
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* Internal function. Do not use directly.
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*/
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MEM_STATIC void* ZSTD_cwksp_reserve_internal(
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ZSTD_cwksp* ws, size_t bytes, ZSTD_cwksp_alloc_phase_e phase) {
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void* alloc;
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void* bottom = ws->tableEnd;
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ZSTD_cwksp_internal_advance_phase(ws, phase);
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alloc = (BYTE *)ws->allocStart - bytes;
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if (bytes == 0)
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return NULL;
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DEBUGLOG(5, "cwksp: reserving %p %zd bytes, %zd bytes remaining",
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alloc, bytes, ZSTD_cwksp_available_space(ws) - bytes);
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ZSTD_cwksp_assert_internal_consistency(ws);
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assert(alloc >= bottom);
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if (alloc < bottom) {
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DEBUGLOG(4, "cwksp: alloc failed!");
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ws->allocFailed = 1;
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return NULL;
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}
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if (alloc < ws->tableValidEnd) {
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ws->tableValidEnd = alloc;
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}
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ws->allocStart = alloc;
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return alloc;
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}
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/*
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* Reserves and returns unaligned memory.
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*/
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MEM_STATIC BYTE* ZSTD_cwksp_reserve_buffer(ZSTD_cwksp* ws, size_t bytes) {
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return (BYTE*)ZSTD_cwksp_reserve_internal(ws, bytes, ZSTD_cwksp_alloc_buffers);
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}
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/*
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* Reserves and returns memory sized on and aligned on sizeof(unsigned).
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*/
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MEM_STATIC void* ZSTD_cwksp_reserve_aligned(ZSTD_cwksp* ws, size_t bytes) {
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assert((bytes & (sizeof(U32)-1)) == 0);
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return ZSTD_cwksp_reserve_internal(ws, ZSTD_cwksp_align(bytes, sizeof(U32)), ZSTD_cwksp_alloc_aligned);
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}
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/*
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* Aligned on sizeof(unsigned). These buffers have the special property that
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* their values remain constrained, allowing us to re-use them without
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* memset()-ing them.
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*/
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MEM_STATIC void* ZSTD_cwksp_reserve_table(ZSTD_cwksp* ws, size_t bytes) {
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const ZSTD_cwksp_alloc_phase_e phase = ZSTD_cwksp_alloc_aligned;
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void* alloc = ws->tableEnd;
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void* end = (BYTE *)alloc + bytes;
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void* top = ws->allocStart;
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DEBUGLOG(5, "cwksp: reserving %p table %zd bytes, %zd bytes remaining",
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alloc, bytes, ZSTD_cwksp_available_space(ws) - bytes);
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assert((bytes & (sizeof(U32)-1)) == 0);
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ZSTD_cwksp_internal_advance_phase(ws, phase);
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ZSTD_cwksp_assert_internal_consistency(ws);
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assert(end <= top);
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if (end > top) {
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DEBUGLOG(4, "cwksp: table alloc failed!");
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ws->allocFailed = 1;
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return NULL;
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}
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ws->tableEnd = end;
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return alloc;
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}
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/*
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* Aligned on sizeof(void*).
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*/
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MEM_STATIC void* ZSTD_cwksp_reserve_object(ZSTD_cwksp* ws, size_t bytes) {
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size_t roundedBytes = ZSTD_cwksp_align(bytes, sizeof(void*));
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void* alloc = ws->objectEnd;
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void* end = (BYTE*)alloc + roundedBytes;
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DEBUGLOG(5,
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"cwksp: reserving %p object %zd bytes (rounded to %zd), %zd bytes remaining",
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alloc, bytes, roundedBytes, ZSTD_cwksp_available_space(ws) - roundedBytes);
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assert(((size_t)alloc & (sizeof(void*)-1)) == 0);
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assert((bytes & (sizeof(void*)-1)) == 0);
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ZSTD_cwksp_assert_internal_consistency(ws);
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/* we must be in the first phase, no advance is possible */
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if (ws->phase != ZSTD_cwksp_alloc_objects || end > ws->workspaceEnd) {
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DEBUGLOG(4, "cwksp: object alloc failed!");
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ws->allocFailed = 1;
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return NULL;
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}
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ws->objectEnd = end;
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ws->tableEnd = end;
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ws->tableValidEnd = end;
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return alloc;
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}
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MEM_STATIC void ZSTD_cwksp_mark_tables_dirty(ZSTD_cwksp* ws) {
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DEBUGLOG(4, "cwksp: ZSTD_cwksp_mark_tables_dirty");
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assert(ws->tableValidEnd >= ws->objectEnd);
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assert(ws->tableValidEnd <= ws->allocStart);
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ws->tableValidEnd = ws->objectEnd;
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ZSTD_cwksp_assert_internal_consistency(ws);
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}
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MEM_STATIC void ZSTD_cwksp_mark_tables_clean(ZSTD_cwksp* ws) {
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DEBUGLOG(4, "cwksp: ZSTD_cwksp_mark_tables_clean");
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assert(ws->tableValidEnd >= ws->objectEnd);
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assert(ws->tableValidEnd <= ws->allocStart);
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if (ws->tableValidEnd < ws->tableEnd) {
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ws->tableValidEnd = ws->tableEnd;
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}
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ZSTD_cwksp_assert_internal_consistency(ws);
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}
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/*
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* Zero the part of the allocated tables not already marked clean.
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*/
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MEM_STATIC void ZSTD_cwksp_clean_tables(ZSTD_cwksp* ws) {
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DEBUGLOG(4, "cwksp: ZSTD_cwksp_clean_tables");
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assert(ws->tableValidEnd >= ws->objectEnd);
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assert(ws->tableValidEnd <= ws->allocStart);
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if (ws->tableValidEnd < ws->tableEnd) {
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ZSTD_memset(ws->tableValidEnd, 0, (BYTE*)ws->tableEnd - (BYTE*)ws->tableValidEnd);
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}
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ZSTD_cwksp_mark_tables_clean(ws);
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}
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/*
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* Invalidates table allocations.
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* All other allocations remain valid.
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*/
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MEM_STATIC void ZSTD_cwksp_clear_tables(ZSTD_cwksp* ws) {
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DEBUGLOG(4, "cwksp: clearing tables!");
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ws->tableEnd = ws->objectEnd;
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ZSTD_cwksp_assert_internal_consistency(ws);
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}
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/*
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* Invalidates all buffer, aligned, and table allocations.
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* Object allocations remain valid.
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*/
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MEM_STATIC void ZSTD_cwksp_clear(ZSTD_cwksp* ws) {
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DEBUGLOG(4, "cwksp: clearing!");
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ws->tableEnd = ws->objectEnd;
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ws->allocStart = ws->workspaceEnd;
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ws->allocFailed = 0;
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if (ws->phase > ZSTD_cwksp_alloc_buffers) {
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ws->phase = ZSTD_cwksp_alloc_buffers;
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}
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ZSTD_cwksp_assert_internal_consistency(ws);
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}
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/*
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* The provided workspace takes ownership of the buffer [start, start+size).
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* Any existing values in the workspace are ignored (the previously managed
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* buffer, if present, must be separately freed).
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*/
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MEM_STATIC void ZSTD_cwksp_init(ZSTD_cwksp* ws, void* start, size_t size, ZSTD_cwksp_static_alloc_e isStatic) {
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DEBUGLOG(4, "cwksp: init'ing workspace with %zd bytes", size);
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assert(((size_t)start & (sizeof(void*)-1)) == 0); /* ensure correct alignment */
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ws->workspace = start;
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ws->workspaceEnd = (BYTE*)start + size;
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ws->objectEnd = ws->workspace;
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ws->tableValidEnd = ws->objectEnd;
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ws->phase = ZSTD_cwksp_alloc_objects;
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ws->isStatic = isStatic;
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ZSTD_cwksp_clear(ws);
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ws->workspaceOversizedDuration = 0;
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ZSTD_cwksp_assert_internal_consistency(ws);
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}
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MEM_STATIC size_t ZSTD_cwksp_create(ZSTD_cwksp* ws, size_t size, ZSTD_customMem customMem) {
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void* workspace = ZSTD_customMalloc(size, customMem);
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DEBUGLOG(4, "cwksp: creating new workspace with %zd bytes", size);
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RETURN_ERROR_IF(workspace == NULL, memory_allocation, "NULL pointer!");
|
|
ZSTD_cwksp_init(ws, workspace, size, ZSTD_cwksp_dynamic_alloc);
|
|
return 0;
|
|
}
|
|
|
|
MEM_STATIC void ZSTD_cwksp_free(ZSTD_cwksp* ws, ZSTD_customMem customMem) {
|
|
void *ptr = ws->workspace;
|
|
DEBUGLOG(4, "cwksp: freeing workspace");
|
|
ZSTD_memset(ws, 0, sizeof(ZSTD_cwksp));
|
|
ZSTD_customFree(ptr, customMem);
|
|
}
|
|
|
|
/*
|
|
* Moves the management of a workspace from one cwksp to another. The src cwksp
|
|
* is left in an invalid state (src must be re-init()'ed before it's used again).
|
|
*/
|
|
MEM_STATIC void ZSTD_cwksp_move(ZSTD_cwksp* dst, ZSTD_cwksp* src) {
|
|
*dst = *src;
|
|
ZSTD_memset(src, 0, sizeof(ZSTD_cwksp));
|
|
}
|
|
|
|
MEM_STATIC size_t ZSTD_cwksp_sizeof(const ZSTD_cwksp* ws) {
|
|
return (size_t)((BYTE*)ws->workspaceEnd - (BYTE*)ws->workspace);
|
|
}
|
|
|
|
MEM_STATIC size_t ZSTD_cwksp_used(const ZSTD_cwksp* ws) {
|
|
return (size_t)((BYTE*)ws->tableEnd - (BYTE*)ws->workspace)
|
|
+ (size_t)((BYTE*)ws->workspaceEnd - (BYTE*)ws->allocStart);
|
|
}
|
|
|
|
MEM_STATIC int ZSTD_cwksp_reserve_failed(const ZSTD_cwksp* ws) {
|
|
return ws->allocFailed;
|
|
}
|
|
|
|
/*-*************************************
|
|
* Functions Checking Free Space
|
|
***************************************/
|
|
|
|
MEM_STATIC size_t ZSTD_cwksp_available_space(ZSTD_cwksp* ws) {
|
|
return (size_t)((BYTE*)ws->allocStart - (BYTE*)ws->tableEnd);
|
|
}
|
|
|
|
MEM_STATIC int ZSTD_cwksp_check_available(ZSTD_cwksp* ws, size_t additionalNeededSpace) {
|
|
return ZSTD_cwksp_available_space(ws) >= additionalNeededSpace;
|
|
}
|
|
|
|
MEM_STATIC int ZSTD_cwksp_check_too_large(ZSTD_cwksp* ws, size_t additionalNeededSpace) {
|
|
return ZSTD_cwksp_check_available(
|
|
ws, additionalNeededSpace * ZSTD_WORKSPACETOOLARGE_FACTOR);
|
|
}
|
|
|
|
MEM_STATIC int ZSTD_cwksp_check_wasteful(ZSTD_cwksp* ws, size_t additionalNeededSpace) {
|
|
return ZSTD_cwksp_check_too_large(ws, additionalNeededSpace)
|
|
&& ws->workspaceOversizedDuration > ZSTD_WORKSPACETOOLARGE_MAXDURATION;
|
|
}
|
|
|
|
MEM_STATIC void ZSTD_cwksp_bump_oversized_duration(
|
|
ZSTD_cwksp* ws, size_t additionalNeededSpace) {
|
|
if (ZSTD_cwksp_check_too_large(ws, additionalNeededSpace)) {
|
|
ws->workspaceOversizedDuration++;
|
|
} else {
|
|
ws->workspaceOversizedDuration = 0;
|
|
}
|
|
}
|
|
|
|
|
|
#endif /* ZSTD_CWKSP_H */
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