mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-05 11:54:01 +08:00
393a339705
Commit d2c5e30c9a
("[PATCH] zoned vm counters: conversion of nr_bounce to per zone counter")
convert statistic of nr_bounce to per zone and one global value in vm_stat,
but it call inc_|dec_zone_page_state on different pages, then different
zones, and cause us to get unexpected value of NR_BOUNCE.
Below is the result on my machine:
Mar 2 09:26:08 udknight kernel: [144766.778265] Mem-Info:
Mar 2 09:26:08 udknight kernel: [144766.778266] DMA per-cpu:
Mar 2 09:26:08 udknight kernel: [144766.778268] CPU 0: hi: 0, btch: 1 usd: 0
Mar 2 09:26:08 udknight kernel: [144766.778269] CPU 1: hi: 0, btch: 1 usd: 0
Mar 2 09:26:08 udknight kernel: [144766.778270] Normal per-cpu:
Mar 2 09:26:08 udknight kernel: [144766.778271] CPU 0: hi: 186, btch: 31 usd: 0
Mar 2 09:26:08 udknight kernel: [144766.778273] CPU 1: hi: 186, btch: 31 usd: 0
Mar 2 09:26:08 udknight kernel: [144766.778274] HighMem per-cpu:
Mar 2 09:26:08 udknight kernel: [144766.778275] CPU 0: hi: 186, btch: 31 usd: 0
Mar 2 09:26:08 udknight kernel: [144766.778276] CPU 1: hi: 186, btch: 31 usd: 0
Mar 2 09:26:08 udknight kernel: [144766.778279] active_anon:46926 inactive_anon:287406 isolated_anon:0
Mar 2 09:26:08 udknight kernel: [144766.778279] active_file:105085 inactive_file:139432 isolated_file:0
Mar 2 09:26:08 udknight kernel: [144766.778279] unevictable:653 dirty:0 writeback:0 unstable:0
Mar 2 09:26:08 udknight kernel: [144766.778279] free:178957 slab_reclaimable:6419 slab_unreclaimable:9966
Mar 2 09:26:08 udknight kernel: [144766.778279] mapped:4426 shmem:305277 pagetables:784 bounce:0
Mar 2 09:26:08 udknight kernel: [144766.778279] free_cma:0
Mar 2 09:26:08 udknight kernel: [144766.778286] DMA free:3324kB min:68kB low:84kB high:100kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15976kB managed:15900kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
Mar 2 09:26:08 udknight kernel: [144766.778287] lowmem_reserve[]: 0 822 3754 3754
Mar 2 09:26:08 udknight kernel: [144766.778293] Normal free:26828kB min:3632kB low:4540kB high:5448kB active_anon:4872kB inactive_anon:68kB active_file:1796kB inactive_file:1796kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:892920kB managed:842560kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:4144kB slab_reclaimable:25676kB slab_unreclaimable:39864kB kernel_stack:1944kB pagetables:3136kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:2412612 all_unreclaimable? yes
Mar 2 09:26:08 udknight kernel: [144766.778294] lowmem_reserve[]: 0 0 23451 23451
Mar 2 09:26:08 udknight kernel: [144766.778299] HighMem free:685676kB min:512kB low:3748kB high:6984kB active_anon:182832kB inactive_anon:1149556kB active_file:418544kB inactive_file:555932kB unevictable:2612kB isolated(anon):0kB isolated(file):0kB present:3001732kB managed:3001732kB mlocked:0kB dirty:0kB writeback:0kB mapped:17704kB shmem:1216964kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:75771152kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Mar 2 09:26:08 udknight kernel: [144766.778300] lowmem_reserve[]: 0 0 0 0
You can see bounce:75771152kB for HighMem, but bounce:0 for lowmem and global.
This patch fix it.
Signed-off-by: Wang YanQing <udknight@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
291 lines
6.5 KiB
C
291 lines
6.5 KiB
C
/* bounce buffer handling for block devices
|
|
*
|
|
* - Split from highmem.c
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/export.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/bio.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/mempool.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/init.h>
|
|
#include <linux/hash.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/printk.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
#include <trace/events/block.h>
|
|
|
|
#define POOL_SIZE 64
|
|
#define ISA_POOL_SIZE 16
|
|
|
|
static mempool_t *page_pool, *isa_page_pool;
|
|
|
|
#if defined(CONFIG_HIGHMEM) || defined(CONFIG_NEED_BOUNCE_POOL)
|
|
static __init int init_emergency_pool(void)
|
|
{
|
|
#if defined(CONFIG_HIGHMEM) && !defined(CONFIG_MEMORY_HOTPLUG)
|
|
if (max_pfn <= max_low_pfn)
|
|
return 0;
|
|
#endif
|
|
|
|
page_pool = mempool_create_page_pool(POOL_SIZE, 0);
|
|
BUG_ON(!page_pool);
|
|
pr_info("pool size: %d pages\n", POOL_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
__initcall(init_emergency_pool);
|
|
#endif
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
/*
|
|
* highmem version, map in to vec
|
|
*/
|
|
static void bounce_copy_vec(struct bio_vec *to, unsigned char *vfrom)
|
|
{
|
|
unsigned long flags;
|
|
unsigned char *vto;
|
|
|
|
local_irq_save(flags);
|
|
vto = kmap_atomic(to->bv_page);
|
|
memcpy(vto + to->bv_offset, vfrom, to->bv_len);
|
|
kunmap_atomic(vto);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
#else /* CONFIG_HIGHMEM */
|
|
|
|
#define bounce_copy_vec(to, vfrom) \
|
|
memcpy(page_address((to)->bv_page) + (to)->bv_offset, vfrom, (to)->bv_len)
|
|
|
|
#endif /* CONFIG_HIGHMEM */
|
|
|
|
/*
|
|
* allocate pages in the DMA region for the ISA pool
|
|
*/
|
|
static void *mempool_alloc_pages_isa(gfp_t gfp_mask, void *data)
|
|
{
|
|
return mempool_alloc_pages(gfp_mask | GFP_DMA, data);
|
|
}
|
|
|
|
/*
|
|
* gets called "every" time someone init's a queue with BLK_BOUNCE_ISA
|
|
* as the max address, so check if the pool has already been created.
|
|
*/
|
|
int init_emergency_isa_pool(void)
|
|
{
|
|
if (isa_page_pool)
|
|
return 0;
|
|
|
|
isa_page_pool = mempool_create(ISA_POOL_SIZE, mempool_alloc_pages_isa,
|
|
mempool_free_pages, (void *) 0);
|
|
BUG_ON(!isa_page_pool);
|
|
|
|
pr_info("isa pool size: %d pages\n", ISA_POOL_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Simple bounce buffer support for highmem pages. Depending on the
|
|
* queue gfp mask set, *to may or may not be a highmem page. kmap it
|
|
* always, it will do the Right Thing
|
|
*/
|
|
static void copy_to_high_bio_irq(struct bio *to, struct bio *from)
|
|
{
|
|
unsigned char *vfrom;
|
|
struct bio_vec tovec, *fromvec = from->bi_io_vec;
|
|
struct bvec_iter iter;
|
|
|
|
bio_for_each_segment(tovec, to, iter) {
|
|
if (tovec.bv_page != fromvec->bv_page) {
|
|
/*
|
|
* fromvec->bv_offset and fromvec->bv_len might have
|
|
* been modified by the block layer, so use the original
|
|
* copy, bounce_copy_vec already uses tovec->bv_len
|
|
*/
|
|
vfrom = page_address(fromvec->bv_page) +
|
|
tovec.bv_offset;
|
|
|
|
bounce_copy_vec(&tovec, vfrom);
|
|
flush_dcache_page(tovec.bv_page);
|
|
}
|
|
|
|
fromvec++;
|
|
}
|
|
}
|
|
|
|
static void bounce_end_io(struct bio *bio, mempool_t *pool, int err)
|
|
{
|
|
struct bio *bio_orig = bio->bi_private;
|
|
struct bio_vec *bvec, *org_vec;
|
|
int i;
|
|
|
|
if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags))
|
|
set_bit(BIO_EOPNOTSUPP, &bio_orig->bi_flags);
|
|
|
|
/*
|
|
* free up bounce indirect pages used
|
|
*/
|
|
bio_for_each_segment_all(bvec, bio, i) {
|
|
org_vec = bio_orig->bi_io_vec + i;
|
|
if (bvec->bv_page == org_vec->bv_page)
|
|
continue;
|
|
|
|
dec_zone_page_state(bvec->bv_page, NR_BOUNCE);
|
|
mempool_free(bvec->bv_page, pool);
|
|
}
|
|
|
|
bio_endio(bio_orig, err);
|
|
bio_put(bio);
|
|
}
|
|
|
|
static void bounce_end_io_write(struct bio *bio, int err)
|
|
{
|
|
bounce_end_io(bio, page_pool, err);
|
|
}
|
|
|
|
static void bounce_end_io_write_isa(struct bio *bio, int err)
|
|
{
|
|
|
|
bounce_end_io(bio, isa_page_pool, err);
|
|
}
|
|
|
|
static void __bounce_end_io_read(struct bio *bio, mempool_t *pool, int err)
|
|
{
|
|
struct bio *bio_orig = bio->bi_private;
|
|
|
|
if (test_bit(BIO_UPTODATE, &bio->bi_flags))
|
|
copy_to_high_bio_irq(bio_orig, bio);
|
|
|
|
bounce_end_io(bio, pool, err);
|
|
}
|
|
|
|
static void bounce_end_io_read(struct bio *bio, int err)
|
|
{
|
|
__bounce_end_io_read(bio, page_pool, err);
|
|
}
|
|
|
|
static void bounce_end_io_read_isa(struct bio *bio, int err)
|
|
{
|
|
__bounce_end_io_read(bio, isa_page_pool, err);
|
|
}
|
|
|
|
#ifdef CONFIG_NEED_BOUNCE_POOL
|
|
static int must_snapshot_stable_pages(struct request_queue *q, struct bio *bio)
|
|
{
|
|
if (bio_data_dir(bio) != WRITE)
|
|
return 0;
|
|
|
|
if (!bdi_cap_stable_pages_required(&q->backing_dev_info))
|
|
return 0;
|
|
|
|
return test_bit(BIO_SNAP_STABLE, &bio->bi_flags);
|
|
}
|
|
#else
|
|
static int must_snapshot_stable_pages(struct request_queue *q, struct bio *bio)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_NEED_BOUNCE_POOL */
|
|
|
|
static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
|
|
mempool_t *pool, int force)
|
|
{
|
|
struct bio *bio;
|
|
int rw = bio_data_dir(*bio_orig);
|
|
struct bio_vec *to, from;
|
|
struct bvec_iter iter;
|
|
unsigned i;
|
|
|
|
if (force)
|
|
goto bounce;
|
|
bio_for_each_segment(from, *bio_orig, iter)
|
|
if (page_to_pfn(from.bv_page) > queue_bounce_pfn(q))
|
|
goto bounce;
|
|
|
|
return;
|
|
bounce:
|
|
bio = bio_clone_bioset(*bio_orig, GFP_NOIO, fs_bio_set);
|
|
|
|
bio_for_each_segment_all(to, bio, i) {
|
|
struct page *page = to->bv_page;
|
|
|
|
if (page_to_pfn(page) <= queue_bounce_pfn(q) && !force)
|
|
continue;
|
|
|
|
to->bv_page = mempool_alloc(pool, q->bounce_gfp);
|
|
inc_zone_page_state(to->bv_page, NR_BOUNCE);
|
|
|
|
if (rw == WRITE) {
|
|
char *vto, *vfrom;
|
|
|
|
flush_dcache_page(page);
|
|
|
|
vto = page_address(to->bv_page) + to->bv_offset;
|
|
vfrom = kmap_atomic(page) + to->bv_offset;
|
|
memcpy(vto, vfrom, to->bv_len);
|
|
kunmap_atomic(vfrom);
|
|
}
|
|
}
|
|
|
|
trace_block_bio_bounce(q, *bio_orig);
|
|
|
|
bio->bi_flags |= (1 << BIO_BOUNCED);
|
|
|
|
if (pool == page_pool) {
|
|
bio->bi_end_io = bounce_end_io_write;
|
|
if (rw == READ)
|
|
bio->bi_end_io = bounce_end_io_read;
|
|
} else {
|
|
bio->bi_end_io = bounce_end_io_write_isa;
|
|
if (rw == READ)
|
|
bio->bi_end_io = bounce_end_io_read_isa;
|
|
}
|
|
|
|
bio->bi_private = *bio_orig;
|
|
*bio_orig = bio;
|
|
}
|
|
|
|
void blk_queue_bounce(struct request_queue *q, struct bio **bio_orig)
|
|
{
|
|
int must_bounce;
|
|
mempool_t *pool;
|
|
|
|
/*
|
|
* Data-less bio, nothing to bounce
|
|
*/
|
|
if (!bio_has_data(*bio_orig))
|
|
return;
|
|
|
|
must_bounce = must_snapshot_stable_pages(q, *bio_orig);
|
|
|
|
/*
|
|
* for non-isa bounce case, just check if the bounce pfn is equal
|
|
* to or bigger than the highest pfn in the system -- in that case,
|
|
* don't waste time iterating over bio segments
|
|
*/
|
|
if (!(q->bounce_gfp & GFP_DMA)) {
|
|
if (queue_bounce_pfn(q) >= blk_max_pfn && !must_bounce)
|
|
return;
|
|
pool = page_pool;
|
|
} else {
|
|
BUG_ON(!isa_page_pool);
|
|
pool = isa_page_pool;
|
|
}
|
|
|
|
/*
|
|
* slow path
|
|
*/
|
|
__blk_queue_bounce(q, bio_orig, pool, must_bounce);
|
|
}
|
|
|
|
EXPORT_SYMBOL(blk_queue_bounce);
|