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a=cvBusfyB2V15izCimMoJ:22 X-Proofpoint-ORIG-GUID: cEVOE2nT5ahYA3QyrgF_OAkB-uMKYba8 Hi Peter, Could you look tif_need_resched_relaxed_wait() and see if the interface (and the implementation via smp_cond_load_relaxed_timeout() -- patch-11 in this series, with smp_cond_load_relaxed_timeout() itself being the patch-1 in the series) seems okay to you. And just a little bit of history on the interface. You had suggested using smp_cond_load_relaxed() way back (https://lore.kernel.org/lkml/20230809134837.GM212435@hirez.programming.kic= ks-ass.net/) when we were trying to use poll_idle() on arm64. That eventually became smp_cond_load_relaxed_timeout() and then Rafael suggested this interface abstracting out all the non idle related details. Rafael J. Wysocki writes: > On Mon, Feb 9, 2026 at 3:43=E2=80=AFAM Ankur Arora wrote: >> >> 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" >> Signed-off-by: Ankur Arora > > This is generally fine with me, of course depending on how > tif_need_resched_relaxed_wait() will work, so conditional on reaching > an agreement with the arch and scheduler folks feel free to add > > Acked-by: Rafael J. Wysocki (Intel) Excellent. Thanks Rafael. Ankur > to this one. > >> --- >> Notes: >> - get rid of unnecessary variable assignments, casts etc >> >> 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 =3D local_clock_noinstr(); >> - >> dev->poll_time_limit =3D false; >> >> raw_local_irq_enable(); >> if (!current_set_polling_and_test()) { >> - unsigned int loop_count =3D 0; >> u64 limit; >> >> limit =3D cpuidle_poll_time(drv, dev); >> >> - while (!need_resched()) { >> - cpu_relax(); >> - if (loop_count++ < POLL_IDLE_RELAX_COUNT) >> - continue; >> - >> - loop_count =3D 0; >> - if (local_clock_noinstr() - time_start > limit) = { >> - dev->poll_time_limit =3D true; >> - break; >> - } >> - } >> + dev->poll_time_limit =3D !tif_need_resched_relaxed_wait(= limit); >> } >> raw_local_irq_disable(); >> >> -- -- ankur