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ANDROID: vendor_hooks: Add hooks for oem futex optimization

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If an important task is going to sleep through do_futex(),
find out it's futex-owner by the pid comes from userspace,
and boost the owner by some means to shorten the sleep time.
How to boost? Depends on these hooks:
53e8099784 ("ANDROID: vendor_hooks: Add hooks for scheduler")

Bug: 243110112
Signed-off-by: xieliujie <xieliujie@oppo.com>
Change-Id: I9a315cfb414fd34e0ef7a2cf9d57df50d4dd984f
This commit is contained in:
xieliujie
2022-08-19 16:16:25 +08:00
committed by Todd Kjos
parent 3c2f107ad2
commit 548da5d23d
3 changed files with 47 additions and 0 deletions
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6
drivers/android/vendor_hooks.c
View File

@@ -106,6 +106,12 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rwsem_write_finished);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alter_rwsem_list_add);
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_do_futex);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_futex_wait_start);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_futex_wait_end);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_futex_wake_traverse_plist);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_futex_wake_this);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_futex_wake_up_q_finish);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mutex_wait_start);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mutex_wait_finish);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rtmutex_wait_start);

34
include/trace/hooks/futex.h
View File

@@ -8,6 +8,10 @@
#include <linux/tracepoint.h>
#include <trace/hooks/vendor_hooks.h>
#include <linux/plist.h>
#ifndef __GENKSYMS__
#include <linux/futex.h>
#endif
/*
* Following tracepoints are not exported in tracefs and provide a
* mechanism for vendor modules to hook and extend functionality
@@ -22,6 +26,36 @@ DECLARE_HOOK(android_vh_futex_sleep_start,
TP_PROTO(struct task_struct *p),
TP_ARGS(p));
DECLARE_HOOK(android_vh_do_futex,
TP_PROTO(int cmd,
unsigned int *flags,
u32 __user *uaddr2),
TP_ARGS(cmd, flags, uaddr2));
DECLARE_HOOK(android_vh_futex_wait_start,
TP_PROTO(unsigned int flags,
u32 bitset),
TP_ARGS(flags, bitset));
DECLARE_HOOK(android_vh_futex_wait_end,
TP_PROTO(unsigned int flags,
u32 bitset),
TP_ARGS(flags, bitset));
DECLARE_HOOK(android_vh_futex_wake_traverse_plist,
TP_PROTO(struct plist_head *chain, int *target_nr,
union futex_key key, u32 bitset),
TP_ARGS(chain, target_nr, key, bitset));
DECLARE_HOOK(android_vh_futex_wake_this,
TP_PROTO(int ret, int nr_wake, int target_nr,
struct task_struct *p),
TP_ARGS(ret, nr_wake, target_nr, p));
DECLARE_HOOK(android_vh_futex_wake_up_q_finish,
TP_PROTO(int nr_wake, int target_nr),
TP_ARGS(nr_wake, target_nr));
/* macro versions of hooks are no longer required */
#endif /* _TRACE_HOOK_FUTEX_H */

7
kernel/futex.c
View File

@@ -1594,6 +1594,7 @@ futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset)
struct futex_q *this, *next;
union futex_key key = FUTEX_KEY_INIT;
int ret;
int target_nr;
DEFINE_WAKE_Q(wake_q);
if (!bitset)
@@ -1611,6 +1612,7 @@ futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset)
spin_lock(&hb->lock);
trace_android_vh_futex_wake_traverse_plist(&hb->chain, &target_nr, key, bitset);
plist_for_each_entry_safe(this, next, &hb->chain, list) {
if (match_futex (&this->key, &key)) {
if (this->pi_state || this->rt_waiter) {
@@ -1622,6 +1624,7 @@ futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset)
if (!(this->bitset & bitset))
continue;
trace_android_vh_futex_wake_this(ret, nr_wake, target_nr, this->task);
mark_wake_futex(&wake_q, this);
if (++ret >= nr_wake)
break;
@@ -1630,6 +1633,7 @@ futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset)
spin_unlock(&hb->lock);
wake_up_q(&wake_q);
trace_android_vh_futex_wake_up_q_finish(nr_wake, target_nr);
return ret;
}
@@ -2699,6 +2703,7 @@ static int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val,
if (!bitset)
return -EINVAL;
q.bitset = bitset;
trace_android_vh_futex_wait_start(flags, bitset);
to = futex_setup_timer(abs_time, &timeout, flags,
current->timer_slack_ns);
@@ -2748,6 +2753,7 @@ out:
hrtimer_cancel(&to->timer);
destroy_hrtimer_on_stack(&to->timer);
}
trace_android_vh_futex_wait_end(flags, bitset);
return ret;
}
@@ -3733,6 +3739,7 @@ long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
return -ENOSYS;
}
trace_android_vh_do_futex(cmd, &flags, uaddr2);
switch (cmd) {
case FUTEX_WAIT:
val3 = FUTEX_BITSET_MATCH_ANY;