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ANDROID: vendor_hooks:vendor hook for mmput

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add vendor hook in mmput while mm_users decreased to 0.

Bug: 238821038
Change-Id: I42a717cbeeb3176bac14b4b2391fdb2366c972d3
Signed-off-by: xiaofeng <xiaofeng5@xiaomi.com>
This commit is contained in:
xiaofeng
2022-07-13 10:23:51 +08:00
parent 242b11e574
commit 8b19ed264b
3 changed files with 7 additions and 1 deletions
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1
drivers/android/vendor_hooks.c
View File

@@ -432,3 +432,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alloc_si);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_free_pages); EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_free_pages);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_set_shmem_page_flag); EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_set_shmem_page_flag);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_pidfd_open); EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_pidfd_open);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mmput);

3
include/trace/hooks/sched.h
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@@ -395,6 +395,9 @@ DECLARE_HOOK(android_vh_pidfd_open,
TP_PROTO(struct pid *p), TP_PROTO(struct pid *p),
TP_ARGS(p)); TP_ARGS(p));
DECLARE_HOOK(android_vh_mmput,
TP_PROTO(void *unused),
TP_ARGS(unused));
/* macro versions of hooks are no longer required */ /* macro versions of hooks are no longer required */
#endif /* _TRACE_HOOK_SCHED_H */ #endif /* _TRACE_HOOK_SCHED_H */

4
kernel/fork.c
View File

@@ -1150,8 +1150,10 @@ void mmput(struct mm_struct *mm)
{ {
might_sleep(); might_sleep();
if (atomic_dec_and_test(&mm->mm_users)) if (atomic_dec_and_test(&mm->mm_users)) {
trace_android_vh_mmput(NULL);
__mmput(mm); __mmput(mm);
}
} }
EXPORT_SYMBOL_GPL(mmput); EXPORT_SYMBOL_GPL(mmput);