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ANDROID: timer: Add vendor hook for timer calc index

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Since we're expecting timers more precisely in short period, add
a vendor hook to calc_index when adding timers. Then we can modify
the index this timer used to make it accurate.

Bug: 178758017
Signed-off-by: Huang Yiwei <hyiwei@codeaurora.org>
Change-Id: Ie0e6493ae7ad53b0cc57eb1bbcf8a0a11f652828
This commit is contained in:
Huang Yiwei 2021-01-29 10:59:25 +08:00 committed by Todd Kjos
parent d4ff3d23ce
commit 9789a88f42
3 changed files with 24 additions and 0 deletions
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2
drivers/android/vendor_hooks.c
View File

@ -31,6 +31,7 @@
#include <trace/hooks/ftrace_dump.h>
#include <trace/hooks/pm_domain.h>
#include <trace/hooks/bug.h>
#include <trace/hooks/timer.h>
/*
* Export tracepoints that act as a bare tracehook (ie: have no trace event
@ -137,3 +138,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_em_cpu_energy);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_cpu_up);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_cpu_down);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_sched_balance_rt);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_timer_calc_index);

19
include/trace/hooks/timer.h Normal file
View File

@ -0,0 +1,19 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM timer
#define TRACE_INCLUDE_PATH trace/hooks
#if !defined(_TRACE_HOOK_TIMER_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_HOOK_TIMER_H
#include <linux/tracepoint.h>
#include <trace/hooks/vendor_hooks.h>
DECLARE_HOOK(android_vh_timer_calc_index,
TP_PROTO(unsigned int lvl, unsigned long *expires),
TP_ARGS(lvl, expires));
#endif /* _TRACE_HOOK_TIMER_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

3
kernel/time/timer.c
View File

@ -55,6 +55,8 @@
#define CREATE_TRACE_POINTS
#include <trace/events/timer.h>
#undef CREATE_TRACE_POINTS
#include <trace/hooks/timer.h>
EXPORT_TRACEPOINT_SYMBOL_GPL(hrtimer_expire_entry);
EXPORT_TRACEPOINT_SYMBOL_GPL(hrtimer_expire_exit);
@ -505,6 +507,7 @@ static inline unsigned calc_index(unsigned long expires, unsigned lvl,
* Round up with level granularity to prevent this.
*/
expires = (expires + LVL_GRAN(lvl)) >> LVL_SHIFT(lvl);
trace_android_vh_timer_calc_index(lvl, &expires);
*bucket_expiry = expires << LVL_SHIFT(lvl);
return LVL_OFFS(lvl) + (expires & LVL_MASK);
}