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ANDROID: sched: add restrict vendor hook to modify task placement policy in EAS

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For modifying task placement policy, we add the hook on the top of
select_task_rq_fair(). It allows us to modify wakeup/fork/exec balance
paths.

Bug: 158263250
Signed-off-by: Yun Hsiang <yun.hsiang@mediatek.com>
Change-Id: I80ff870453472e183ab2aae7381bff91e49ae296
This commit is contained in:
Yun Hsiang
2020-05-20 10:31:35 +08:00
committed by Quentin Perret
parent 987d0b5bcf
commit a1fc1fba46
3 changed files with 32 additions and 1 deletions
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3
drivers/android/vendor_hooks.c
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@@ -8,9 +8,10 @@
#define CREATE_TRACE_POINTS
#include <trace/hooks/vendor_hooks.h>
#include <trace/hooks/sched.h>
/*
* Export tracepoints that act as a bare tracehook (ie: have no trace event
* associated with them) to allow external modules to probe them.
*/
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_select_task_rq_fair);

23
include/trace/hooks/sched.h Normal file
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@@ -0,0 +1,23 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM sched
#define TRACE_INCLUDE_PATH trace/hooks
#if !defined(_TRACE_HOOK_SCHED_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_HOOK_SCHED_H
#include <linux/tracepoint.h>
#include <trace/hooks/vendor_hooks.h>
/*
* Following tracepoints are not exported in tracefs and provide a
* mechanism for vendor modules to hook and extend functionality
*/
#if defined(CONFIG_TRACEPOINTS) && defined(CONFIG_ANDROID_VENDOR_HOOKS)
struct task_struct;
DECLARE_RESTRICTED_HOOK(android_rvh_select_task_rq_fair,
TP_PROTO(struct task_struct *p, int prev_cpu, int sd_flag, int wake_flags, int *new_cpu),
TP_ARGS(p, prev_cpu, sd_flag, wake_flags, new_cpu), 1);
#else
#define trace_android_rvh_select_task_rq_fair(p, prev_cpu, sd_flag, wake_flags, new_cpu)
#endif
#endif /* _TRACE_HOOK_SCHED_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

7
kernel/sched/fair.c
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@@ -23,6 +23,7 @@
#include "sched.h"
#include <trace/events/sched.h>
#include <trace/hooks/sched.h>
/*
* Targeted preemption latency for CPU-bound tasks:
@@ -6706,6 +6707,12 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f
int new_cpu = prev_cpu;
int want_affine = 0;
int sync = (wake_flags & WF_SYNC) && !(current->flags & PF_EXITING);
int target_cpu = -1;
trace_android_rvh_select_task_rq_fair(p, prev_cpu, sd_flag,
wake_flags, &target_cpu);
if (target_cpu >= 0)
return target_cpu;
if (sd_flag & SD_BALANCE_WAKE) {
record_wakee(p);