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softmmu/cpus: Check if the cpu work list is empty atomically

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Instead of taking the lock of the cpu work list in order to check if it's
empty, we can just read the head pointer atomically. This decreases
cpu_work_list_empty's share from 5% to 1.3% in a profile of icount-enabled
aarch64-softmmu.

Signed-off-by: Idan Horowitz <idan.horowitz@gmail.com>
Message-Id: <20220114004358.299534-1-idan.horowitz@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Idan Horowitz 2022-01-14 02:43:57 +02:00 committed by Richard Henderson
parent cfc2a2d69d
commit 25e82fb769
1 changed files with 1 additions and 6 deletions
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7
softmmu/cpus.c
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@ -73,12 +73,7 @@ bool cpu_is_stopped(CPUState *cpu)
bool cpu_work_list_empty(CPUState *cpu)
{
bool ret;
qemu_mutex_lock(&cpu->work_mutex);
ret = QSIMPLEQ_EMPTY(&cpu->work_list);
qemu_mutex_unlock(&cpu->work_mutex);
return ret;
return QSIMPLEQ_EMPTY_ATOMIC(&cpu->work_list);
}
bool cpu_thread_is_idle(CPUState *cpu)