ich777/linux_media
1
0
Fork 0
mirror of https://github.com/tbsdtv/linux_media.git synced 2025-07-23 20:51:03 +02:00
Code Issues Packages Projects Releases Wiki Activity

page_ext: introduce boot parameter 'early_page_ext'

Browse Source 
In commit 2f1ee0913c ("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>
This commit is contained in:
Li Zhe
2022-08-25 18:27:14 +08:00
committed by Andrew Morton
parent 1a6baaa0db
commit c4f20f1479
5 changed files with 34 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
include/linux/page_ext.h
View File

@@ -36,9 +36,15 @@ struct page_ext {
unsigned long flags;
};
extern bool early_page_ext;
extern unsigned long page_ext_size;
extern void pgdat_page_ext_init(struct pglist_data *pgdat);
static inline bool early_page_ext_enabled(void)
{
return early_page_ext;
}
#ifdef CONFIG_SPARSEMEM
static inline void page_ext_init_flatmem(void)
{
@@ -68,6 +74,11 @@ static inline struct page_ext *page_ext_next(struct page_ext *curr)
#else /* !CONFIG_PAGE_EXTENSION */
struct page_ext;
static inline bool early_page_ext_enabled(void)
{
return false;
}
static inline void pgdat_page_ext_init(struct pglist_data *pgdat)
{
}