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ANDROID: futex: Add vendor hook for wait queue

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Add the hook for the waiter list of futex to allow
vendor perform wait queue enhancement

Bug: 381487678

Signed-off-by: JianMin Liu <jian-min.liu@mediatek.com>
Signed-off-by: Guan-Wun Chen <guan-wun.chen@mediatek.corp-partner.google.com>
Change-Id: I68218b89c35b23aa5529099bb0bbbd031bdeafef
This commit is contained in:
JianMin Liu
2020-08-11 15:24:06 +08:00
committed by Treehugger Robot
parent 067ce58e1a
commit 58f9c9a064
3 changed files with 29 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/android/vendor_hooks.c
+2
View File
@@ -46,6 +46,7 @@
#include <trace/hooks/topology.h>
#include <trace/hooks/rwsem.h>
#include <trace/hooks/bl_hib.h>
#include <trace/hooks/futex.h>
/*
* Export tracepoints that act as a bare tracehook (ie: have no trace event
@@ -164,3 +165,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mutex_unlock_slowpath);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_check_hibernation_swap);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_save_cpu_resume);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_save_hib_resume_bdev);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alter_futex_plist_add);
include/trace/hooks/futex.h
+22
View File
@@ -0,0 +1,22 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM futex
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH trace/hooks
#if !defined(_TRACE_HOOK_FUTEX_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_HOOK_FUTEX_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
*/
struct plist_node;
struct plist_head;
DECLARE_HOOK(android_vh_alter_futex_plist_add,
TP_PROTO(struct plist_node *node,
struct plist_head *head,
bool *already_on_hb),
TP_ARGS(node, head, already_on_hb));
#endif /* _TRACE_HOOK_FUTEX_H */
/* This part must be outside protection */
#include <trace/define_trace.h>
kernel/futex/core.c
+5 -1
View File
@@ -42,6 +42,7 @@
#include "futex.h"
#include "../locking/rtmutex_common.h"
#include <trace/hooks/futex.h>
/*
* The base of the bucket array and its size are always used together
@@ -557,6 +558,7 @@ void futex_q_unlock(struct futex_hash_bucket *hb)
void __futex_queue(struct futex_q *q, struct futex_hash_bucket *hb)
{
int prio;
bool already_on_hb = false;
/*
* The priority used to register this element is
@@ -569,7 +571,9 @@ void __futex_queue(struct futex_q *q, struct futex_hash_bucket *hb)
prio = min(current->normal_prio, MAX_RT_PRIO);
plist_node_init(&q->list, prio);
plist_add(&q->list, &hb->chain);
trace_android_vh_alter_futex_plist_add(&q->list, &hb->chain, &already_on_hb);
if (!already_on_hb)
plist_add(&q->list, &hb->chain);
q->task = current;
}