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ANDROID: vendor_hooks: Allow shared pages reclaim via MADV_PAGEOUT

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Add a hook in madvise_cold_or_pageout_pte_range() to allow
vendor modules to influence the shared pages reclaim.

Bug: 242678506
Change-Id: I269a385b59f7291c2e96478674bb3d05f94584cb
Signed-off-by: Pavankumar Kondeti <quic_pkondeti@quicinc.com>
This commit is contained in:
Pavankumar Kondeti 2022-09-26 18:36:10 +05:30
parent 2d8afda40e
commit 6d04d8ce90
3 changed files with 7 additions and 1 deletions
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1
drivers/android/vendor_hooks.c
View File

@ -441,6 +441,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_drain_slots_cache_cpu);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alloc_swap_slot_cache);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_free_swap_slot);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_get_swap_page);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_madvise_cold_or_pageout);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_page_isolated_for_reclaim);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_inactive_is_low);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_snapshot_refaults);

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

@ -237,6 +237,9 @@ DECLARE_HOOK(android_vh_get_swap_page,
TP_PROTO(struct page *page, swp_entry_t *entry,
struct swap_slots_cache *cache, bool *found),
TP_ARGS(page, entry, cache, found));
DECLARE_HOOK(android_vh_madvise_cold_or_pageout,
TP_PROTO(struct vm_area_struct *vma, bool *allow_shared),
TP_ARGS(vma, allow_shared));
DECLARE_HOOK(android_vh_page_isolated_for_reclaim,
TP_PROTO(struct mm_struct *mm, struct page *page),
TP_ARGS(mm, page));

4
mm/madvise.c
View File

@ -319,10 +319,12 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd,
spinlock_t *ptl;
struct page *page = NULL;
LIST_HEAD(page_list);
bool allow_shared = false;
if (fatal_signal_pending(current))
return -EINTR;
trace_android_vh_madvise_cold_or_pageout(vma, &allow_shared);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
if (pmd_trans_huge(*pmd)) {
pmd_t orig_pmd;
@ -438,7 +440,7 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd,
}
/* Do not interfere with other mappings of this page */
if (page_mapcount(page) != 1)
if (!allow_shared && page_mapcount(page) != 1)
continue;
VM_BUG_ON_PAGE(PageTransCompound(page), page);