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During compaction isolated free pages are marked allocated so that they can be split and/or freed. For that, post_alloc_hook() is used inside split_map_pages() and release_free_list(). split_map_pages() marks free pages allocated, splits the pages and then lets alloc_contig_range_noprof() free those pages. release_free_list() marks free pages and immediately frees them. This usage of post_alloc_hook() affect memory allocation profiling because these functions might not be called from an instrumented allocator, therefore current->alloc_tag is NULL and when debugging is enabled (CONFIG_MEM_ALLOC_PROFILING_DEBUG=y) that causes warnings. To avoid that, wrap such post_alloc_hook() calls into an instrumented function which acts as an allocator which will be charged for these fake allocations. Note that these allocations are very short lived until they are freed, therefore the associated counters should usually read 0. Link: https://lkml.kernel.org/r/20240614230504.3849136-1-surenb@google.com Signed-off-by: Suren Baghdasaryan <surenb@google.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Kees Cook <keescook@chromium.org> Cc: Kent Overstreet <kent.overstreet@linux.dev> Cc: Pasha Tatashin <pasha.tatashin@soleen.com> Cc: Sourav Panda <souravpanda@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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| certs | ||
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| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
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| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.