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ANDROID: vendor_hooks: Add hooks for futex

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We want to use this hook to record the sleeping time due to Futex

Bug: 210947226

Signed-off-by: Liujie Xie <xieliujie@oppo.com>
Change-Id: I637f889dce42937116d10979e0c40fddf96cd1a2
(cherry picked from commit a7ab784f60)
This commit is contained in:
Liujie Xie
2021-12-16 17:07:54 +08:00
committed by Treehugger Robot
parent 319d27a217
commit 08d7a5f89e
3 changed files with 9 additions and 1 deletions
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1
drivers/android/vendor_hooks.c
View File

@@ -87,6 +87,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_restore_priority);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_wakeup_ilocked);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_do_send_sig_info);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alter_futex_plist_add);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_futex_sleep_start);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mutex_wait_start);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mutex_wait_finish);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mutex_init);

5
include/trace/hooks/futex.h
View File

@@ -18,6 +18,11 @@ DECLARE_HOOK(android_vh_alter_futex_plist_add,
struct plist_head *head,
bool *already_on_hb),
TP_ARGS(node, head, already_on_hb));
DECLARE_HOOK(android_vh_futex_sleep_start,
TP_PROTO(struct task_struct *p),
TP_ARGS(p));
#endif /* _TRACE_HOOK_FUTEX_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

4
kernel/futex/core.c
View File

@@ -2853,8 +2853,10 @@ static void futex_wait_queue_me(struct futex_hash_bucket *hb, struct futex_q *q,
* flagged for rescheduling. Only call schedule if there
* is no timeout, or if it has yet to expire.
*/
if (!timeout || timeout->task)
if (!timeout || timeout->task) {
trace_android_vh_futex_sleep_start(current);
freezable_schedule();
}
}
__set_current_state(TASK_RUNNING);
}