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17:55 +0530, Ankur Arora wrote: >> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe. >> >> >> >> The inner loop in poll_idle() polls over the thread_info flags, >> waiting to see if the thread has TIF_NEED_RESCHED set. The loop >> exits once the condition is met, or if the poll time limit has >> been exceeded. >> >> To minimize the number of instructions executed in each iteration, >> the time check is rate-limited. In addition, each loop iteration >> executes cpu_relax() which on certain platforms provides a hint to >> the pipeline that the loop busy-waits, allowing the processor to >> reduce power consumption. >> >> Switch over to tif_need_resched_relaxed_wait() instead, since that >> provides exactly that. >> >> However, since we want to minimize power consumption in idle, building >> of cpuidle/poll_state.c continues to depend on CONFIG_ARCH_HAS_CPU_RELAX >> as that serves as an indicator that the platform supports an optimized >> version of tif_need_resched_relaxed_wait() (via >> smp_cond_load_acquire_timeout()). >> >> Cc: Rafael J. Wysocki >> Cc: Daniel Lezcano >> Cc: linux-pm@vger.kernel.org >> Suggested-by: Rafael J. Wysocki >> Acked-by: Rafael J. Wysocki (Intel) >> Signed-off-by: Ankur Arora >> --- >> drivers/cpuidle/poll_state.c | 21 +-------------------- >> 1 file changed, 1 insertion(+), 20 deletions(-) >> >> diff --git a/drivers/cpuidle/poll_state.c b/drivers/cpuidle/poll_state.c >> index c7524e4c522a..7443b3e971ba 100644 >> --- a/drivers/cpuidle/poll_state.c >> +++ b/drivers/cpuidle/poll_state.c >> @@ -6,41 +6,22 @@ >> #include >> #include >> #include >> -#include >> -#include >> #include >> #include >> #include >> >> -#define POLL_IDLE_RELAX_COUNT 200 >> - >> static int __cpuidle poll_idle(struct cpuidle_device *dev, >> struct cpuidle_driver *drv, int index) >> { >> - u64 time_start; >> - >> - time_start = local_clock_noinstr(); >> - >> dev->poll_time_limit = false; >> >> raw_local_irq_enable(); >> if (!current_set_polling_and_test()) { >> - unsigned int loop_count = 0; >> u64 limit; >> >> limit = cpuidle_poll_time(drv, dev); >> >> - while (!need_resched()) { >> - cpu_relax(); >> - if (loop_count++ < POLL_IDLE_RELAX_COUNT) >> - continue; >> - >> - loop_count = 0; >> - if (local_clock_noinstr() - time_start > limit) { >> - dev->poll_time_limit = true; >> - break; >> - } >> - } >> + dev->poll_time_limit = !tif_need_resched_relaxed_wait(limit); >> } >> raw_local_irq_disable(); >> >> -- >> 2.31.1 >> > > Hi Ankur, > > Tested atop latest mainline d60bc1401 with the rest of your haltpoll > changes from separate thread: > ~10% improvement in `perf sched bench pipe` micro and ~4-6% throughput > improvements in mysql, > postgresql, cassandra, and memcached in under-loaded configurations. > Tested on AWS Graviton3 and > Graviton4, ARM Neoverse V1 and V2 cores respectively. > > I hope this series can merge soon. It's been stuck in review for more > than 2 years. > > Tested-by: Haris Okanovic Thanks Haris. Yeah, I don't think there are any open issues left on this. -- ankur