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ANDROID: vendor_hooks: add hooks for exting task's swp_entrys

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The process exit time is mainly caused by freeing its swp_entrys. When
low memory triggers to kill lots of processes exit simultaneously, there
is a problem of CPU high load occupied by the exiting processes.

This feature is used to asynchronously maintain and release the
swp_entrys of the exiting process to accelerate the efficiency of the
exiting process.

Bug: 364480846
Bug: 340798358
Change-Id: I6fc0b813e7ac6a0796e08ce7a17d5ff3ab2b799b
Signed-off-by: Justin Jiang <justinjiang@vivo.corp-partner.google.com>
This commit is contained in:
Justin Jiang
2024-09-04 15:31:04 +08:00
committed by Matthias Männich
parent 03a4ae5d99
commit 9eca8763c1
5 changed files with 32 additions and 0 deletions
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5
drivers/android/vendor_hooks.c
View File

@@ -442,3 +442,8 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_folio_trylock_clear);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_folio_trylock_set);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_handle_trylock_failed_folio);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_hibernate_state);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_swapmem_gather_init);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_swapmem_gather_add_bypass);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_swapmem_gather_finish);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_oom_swapmem_gather_init);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_oom_swapmem_gather_finish);

15
include/trace/hooks/mm.h
View File

@@ -246,6 +246,21 @@ DECLARE_HOOK(android_vh_shmem_swapin_folio,
DECLARE_HOOK(android_vh_madvise_cold_or_pageout_page,
TP_PROTO(bool pageout, struct page *page),
TP_ARGS(pageout, page));
DECLARE_HOOK(android_vh_swapmem_gather_init,
TP_PROTO(struct mm_struct *mm),
TP_ARGS(mm));
DECLARE_HOOK(android_vh_swapmem_gather_add_bypass,
TP_PROTO(struct mm_struct *mm, swp_entry_t entry, bool *bypass),
TP_ARGS(mm, entry, bypass));
DECLARE_HOOK(android_vh_swapmem_gather_finish,
TP_PROTO(struct mm_struct *mm),
TP_ARGS(mm));
DECLARE_HOOK(android_vh_oom_swapmem_gather_init,
TP_PROTO(struct mm_struct *mm),
TP_ARGS(mm));
DECLARE_HOOK(android_vh_oom_swapmem_gather_finish,
TP_PROTO(struct mm_struct *mm),
TP_ARGS(mm));
#endif /* _TRACE_HOOK_MM_H */
/* This part must be outside protection */

5
mm/memory.c
View File

@@ -1426,6 +1426,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
pte_t *start_pte;
pte_t *pte;
swp_entry_t entry;
bool bypass = false;
tlb_change_page_size(tlb, PAGE_SIZE);
again:
@@ -1498,6 +1499,9 @@ again:
if (!should_zap_cows(details))
continue;
rss[MM_SWAPENTS]--;
trace_android_vh_swapmem_gather_add_bypass(mm, entry, &bypass);
if (bypass)
goto skip;
if (unlikely(!free_swap_and_cache(entry)))
print_bad_pte(vma, addr, ptent, NULL);
} else if (is_migration_entry(entry)) {
@@ -1517,6 +1521,7 @@ again:
/* We should have covered all the swap entry types */
WARN_ON_ONCE(1);
}
skip:
pte_clear_not_present_full(mm, addr, pte, tlb->fullmm);
zap_install_uffd_wp_if_needed(vma, addr, pte, details, ptent);
} while (pte++, addr += PAGE_SIZE, addr != end);

2
mm/mmap.c
View File

@@ -3329,9 +3329,11 @@ void exit_mmap(struct mm_struct *mm)
lru_add_drain();
flush_cache_mm(mm);
tlb_gather_mmu_fullmm(&tlb, mm);
trace_android_vh_swapmem_gather_init(mm);
/* update_hiwater_rss(mm) here? but nobody should be looking */
/* Use ULONG_MAX here to ensure all VMAs in the mm are unmapped */
unmap_vmas(&tlb, &mm->mm_mt, vma, 0, ULONG_MAX, vma->vm_end, ULONG_MAX, false);
trace_android_vh_swapmem_gather_finish(mm);
mmap_read_unlock(mm);
/*

5
mm/oom_kill.c
View File

@@ -53,6 +53,9 @@
#define CREATE_TRACE_POINTS
#include <trace/events/oom.h>
#undef CREATE_TRACE_POINTS
#include <trace/hooks/mm.h>
static int sysctl_panic_on_oom;
static int sysctl_oom_kill_allocating_task;
static int sysctl_oom_dump_tasks = 1;
@@ -525,6 +528,7 @@ bool __oom_reap_task_mm(struct mm_struct *mm)
*/
set_bit(MMF_UNSTABLE, &mm->flags);
trace_android_vh_oom_swapmem_gather_init(mm);
for_each_vma(vmi, vma) {
if (vma->vm_flags & (VM_HUGETLB|VM_PFNMAP))
continue;
@@ -557,6 +561,7 @@ bool __oom_reap_task_mm(struct mm_struct *mm)
tlb_finish_mmu(&tlb);
}
}
trace_android_vh_oom_swapmem_gather_finish(mm);
return ret;
}