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ANDROID: vendor_hook: Add hook in __free_pages()

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Provide a vendor hook android_vh_free_pages to clear the
information in struct page_ext, when the page is freed.

Bug: 234214858
Signed-off-by: Bing Han <bing.han@transsion.com>
Change-Id: Iac8e3a72f59f8d3ae16dbc93d94034fe4b627d61
This commit is contained in:
Bing Han 2022-06-11 18:24:07 +08:00 • committed by Treehugger Robot
commit 01680ae117
3 changed files with 5 additions and 0 deletions
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1
drivers/android/vendor_hooks.c
View file

@ -429,3 +429,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_unuse_swap_page);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_init_swap_info_struct);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_si_swapinfo);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alloc_si);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_free_pages);

3
include/trace/hooks/mm.h
View file

@ -212,6 +212,9 @@ DECLARE_HOOK(android_vh_si_swapinfo,
DECLARE_HOOK(android_vh_alloc_si,
TP_PROTO(struct swap_info_struct **p, bool *skip),
TP_ARGS(p, skip));
DECLARE_HOOK(android_vh_free_pages,
TP_PROTO(struct page *page, unsigned int order),
TP_ARGS(page, order));
/* macro versions of hooks are no longer required */
#endif /* _TRACE_HOOK_MM_H */

1
mm/page_alloc.c
View file

@ -5180,6 +5180,7 @@ static inline void free_the_page(struct page *page, unsigned int order)
void __free_pages(struct page *page, unsigned int order)
{
trace_android_vh_free_pages(page, order);
if (put_page_testzero(page))
free_the_page(page, order);
else if (!PageHead(page))