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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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7
kernel/futex.c
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@@ -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;