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ANDROID: vendor_hooks: protect multi-mapcount pages in kernel

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Support two hooks as follows to protect multi-mapcount pages in kernel:

- trace_android_vh_page_should_be_protect
- trace_android_vh_mapped_page_try_sorthead

Bug: 236578020
Signed-off-by: Peifeng Li <lipeifeng@oppo.com>
Change-Id: I688aceabf17d9de2feac7c3ad7144d307de6ef29
This commit is contained in:
Peifeng Li
2022-06-23 15:15:46 +08:00
committed by Suren Baghdasaryan
parent 09ebd2be6e
commit ce8b55bb08
4 changed files with 22 additions and 0 deletions
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2
drivers/android/vendor_hooks.c
View File

@@ -429,3 +429,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_do_traversal_lruvec);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_update_page_mapcount);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_add_page_to_lrulist);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_del_page_from_lrulist);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_page_should_be_protected);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mark_page_accessed);

6
include/trace/hooks/mm.h
View File

@@ -107,6 +107,12 @@ DECLARE_HOOK(android_vh_show_mapcount_pages,
DECLARE_HOOK(android_vh_do_traversal_lruvec,
TP_PROTO(struct lruvec *lruvec),
TP_ARGS(lruvec));
DECLARE_HOOK(android_vh_page_should_be_protected,
TP_PROTO(struct page *page, bool *should_protect),
TP_ARGS(page, should_protect));
DECLARE_HOOK(android_vh_mark_page_accessed,
TP_PROTO(struct page *page),
TP_ARGS(page));
#endif /* _TRACE_HOOK_MM_H */

1
mm/swap.c
View File

@@ -445,6 +445,7 @@ void mark_page_accessed(struct page *page)
return;
}
trace_android_vh_mark_page_accessed(page);
if (!PageReferenced(page)) {
SetPageReferenced(page);
} else if (PageUnevictable(page)) {

13
mm/vmscan.c
View File

@@ -1256,6 +1256,11 @@ static enum page_references page_check_references(struct page *page,
{
int referenced_ptes, referenced_page;
unsigned long vm_flags;
bool should_protect = false;
trace_android_vh_page_should_be_protected(page, &should_protect);
if (unlikely(should_protect))
return PAGEREF_ACTIVATE;
referenced_ptes = page_referenced(page, 1, sc->target_mem_cgroup,
&vm_flags);
@@ -2387,6 +2392,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
int file = is_file_lru(lru);
struct pglist_data *pgdat = lruvec_pgdat(lruvec);
bool bypass = false;
bool should_protect = false;
lru_add_drain();
@@ -2421,6 +2427,13 @@ static void shrink_active_list(unsigned long nr_to_scan,
}
}
trace_android_vh_page_should_be_protected(page, &should_protect);
if (unlikely(should_protect)) {
nr_rotated += thp_nr_pages(page);
list_add(&page->lru, &l_active);
continue;
}
trace_android_vh_page_referenced_check_bypass(page, nr_to_scan, lru, &bypass);
if (bypass)
goto skip_page_referenced;