From 8b19ed264b40220326562a29f7ffc1342ba61c08 Mon Sep 17 00:00:00 2001 From: xiaofeng Date: Wed, 13 Jul 2022 10:23:51 +0800 Subject: [PATCH] ANDROID: vendor_hooks:vendor hook for mmput add vendor hook in mmput while mm_users decreased to 0. Bug: 238821038 Change-Id: I42a717cbeeb3176bac14b4b2391fdb2366c972d3 Signed-off-by: xiaofeng --- drivers/android/vendor_hooks.c | 1 + include/trace/hooks/sched.h | 3 +++ kernel/fork.c | 4 +++- 3 files changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/android/vendor_hooks.c b/drivers/android/vendor_hooks.c index 0425524e57dd..5a8e8aa2ed34 100644 --- a/drivers/android/vendor_hooks.c +++ b/drivers/android/vendor_hooks.c @@ -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_set_shmem_page_flag); EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_pidfd_open); +EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mmput); diff --git a/include/trace/hooks/sched.h b/include/trace/hooks/sched.h index 7d964e4d947a..551cab4d1649 100644 --- a/include/trace/hooks/sched.h +++ b/include/trace/hooks/sched.h @@ -395,6 +395,9 @@ DECLARE_HOOK(android_vh_pidfd_open, TP_PROTO(struct pid *p), TP_ARGS(p)); +DECLARE_HOOK(android_vh_mmput, + TP_PROTO(void *unused), + TP_ARGS(unused)); /* macro versions of hooks are no longer required */ #endif /* _TRACE_HOOK_SCHED_H */ diff --git a/kernel/fork.c b/kernel/fork.c index 3b281326c0e1..58409b7178c2 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1150,8 +1150,10 @@ void mmput(struct mm_struct *mm) { 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); + } } EXPORT_SYMBOL_GPL(mmput);