openkylin
/
platform_kernel-5.15
mirror of https://gitee.com/openkylin/platform_kernel-5.15.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

ANDROID: timer: Add vendor hook for timer calc index 

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 Vamsi Krishna Lanka
parent 0b26a3bc29
commit 1855071010
3 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/android/vendor_hooks.c
View File

@ -33,6 +33,7 @@
#include <trace/hooks/sys.h>
#include <trace/hooks/iommu.h>
#include <trace/hooks/net.h>
#include <trace/hooks/timer.h>
/*
* Export tracepoints that act as a bare tracehook (ie: have no trace event
@ -129,3 +130,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_cgroup_attach);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_iommu_setup_dma_ops);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_ptype_head);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_kfree_skb);
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>
__visible u64 jiffies_64 __cacheline_aligned_in_smp = INITIAL_JIFFIES;
@ -503,6 +505,7 @@ 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);
}