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| author | Li Zhe <lizhe.67@bytedance.com> | 2022-08-25 12:27:14 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-09-12 05:26:02 +0200 |
| commit | c4f20f1479c456d9dd1c1e6d8bf956a25de742dc (patch) | |
| tree | 794e5c5ce897f4eaa4133eeb220075e3147929d9 /Documentation/admin-guide | |
| parent | s390/hugetlb: switch to generic version of follow_huge_pud() (diff) | |
| download | linux-c4f20f1479c456d9dd1c1e6d8bf956a25de742dc.tar.xz linux-c4f20f1479c456d9dd1c1e6d8bf956a25de742dc.zip | |
page_ext: introduce boot parameter 'early_page_ext'
In commit 2f1ee0913ce5 ("Revert "mm: use early_pfn_to_nid in
page_ext_init""), we call page_ext_init() after page_alloc_init_late() to
avoid some panic problem. It seems that we cannot track early page
allocations in current kernel even if page structure has been initialized
early.
This patch introduces a new boot parameter 'early_page_ext' to resolve
this problem. If we pass it to the kernel, page_ext_init() will be moved
up and the feature 'deferred initialization of struct pages' will be
disabled to initialize the page allocator early and prevent the panic
problem above. It can help us to catch early page allocations. This is
useful especially when we find that the free memory value is not the same
right after different kernel booting.
[akpm@linux-foundation.org: fix section issue by removing __meminitdata]
Link: https://lkml.kernel.org/r/20220825102714.669-1-lizhe.67@bytedance.com
Signed-off-by: Li Zhe <lizhe.67@bytedance.com>
Suggested-by: Michal Hocko <mhocko@suse.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Jason A. Donenfeld <Jason@zx2c4.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 426fa892d311..3b95f65bafe2 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1471,6 +1471,14 @@ Permit 'security.evm' to be updated regardless of current integrity status. + early_page_ext [KNL] Enforces page_ext initialization to earlier + stages so cover more early boot allocations. + Please note that as side effect some optimizations + might be disabled to achieve that (e.g. parallelized + memory initialization is disabled) so the boot process + might take longer, especially on systems with a lot of + memory. Available with CONFIG_PAGE_EXTENSION=y. + failslab= fail_usercopy= fail_page_alloc= |