| Message ID | 20240220171457.703-12-kprateek.nayak@amd.com (mailing list archive) |
|---|---|
| State | RFC, archived |
| Headers | show |
| Series | [RFC,01/14] thread_info: Add helpers to test and clear TIF_NOTIFY_IPI | expand |
On Wed, Feb 21, 2024 at 1:20 AM K Prateek Nayak <kprateek.nayak@amd.com> wrote: > > Add support for TIF_NOTIFY_IPI on C-SKY. With TIF_NOTIFY_IPI, a sender > sending an IPI to an idle CPU in TIF_POLLING mode will set the > TIF_NOTIFY_IPI flag in the target's idle tasks's thread_info to pull the > CPU out of idle, as opposed to setting TIF_NEED_RESCHED previously. This > avoids spurious calls to schedule_idle() in cases where an IPI does not > necessarily wake up a task on the idle CPU. > > Cc: Guo Ren <guoren@kernel.org> > Cc: "Rafael J. Wysocki" <rafael@kernel.org> > Cc: Daniel Lezcano <daniel.lezcano@linaro.org> > Cc: Ingo Molnar <mingo@redhat.com> > Cc: Peter Zijlstra <peterz@infradead.org> > Cc: Juri Lelli <juri.lelli@redhat.com> > Cc: Vincent Guittot <vincent.guittot@linaro.org> > Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> > Cc: Steven Rostedt <rostedt@goodmis.org> > Cc: Ben Segall <bsegall@google.com> > Cc: Mel Gorman <mgorman@suse.de> > Cc: Daniel Bristot de Oliveira <bristot@redhat.com> > Cc: Valentin Schneider <vschneid@redhat.com> > Cc: K Prateek Nayak <kprateek.nayak@amd.com> > Cc: linux-csky@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > Cc: linux-pm@vger.kernel.org > Signed-off-by: K Prateek Nayak <kprateek.nayak@amd.com> > --- > arch/csky/include/asm/thread_info.h | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/csky/include/asm/thread_info.h b/arch/csky/include/asm/thread_info.h > index b5ed788f0c68..9bc7a037c476 100644 > --- a/arch/csky/include/asm/thread_info.h > +++ b/arch/csky/include/asm/thread_info.h > @@ -61,6 +61,7 @@ static inline struct thread_info *current_thread_info(void) > #define TIF_SYSCALL_TRACEPOINT 5 /* syscall tracepoint instrumentation */ > #define TIF_SYSCALL_AUDIT 6 /* syscall auditing */ > #define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ > +#define TIF_NOTIFY_IPI 8 /* Pending IPI on TIF_POLLLING idle CPU */ > #define TIF_POLLING_NRFLAG 16 /* poll_idle() is TIF_NEED_RESCHED */ > #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ > #define TIF_RESTORE_SIGMASK 20 /* restore signal mask in do_signal() */ > @@ -73,6 +74,7 @@ static inline struct thread_info *current_thread_info(void) > #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) > #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) > #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) > +#define _TIF_NOTIFY_IPI (1 << TIF_NOTIFY_IPI) > #define _TIF_UPROBE (1 << TIF_UPROBE) > #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) > #define _TIF_MEMDIE (1 << TIF_MEMDIE) > -- > 2.34.1 > LGTM Acked-by: Guo Ren <guoren@kernel.org>
diff --git a/arch/csky/include/asm/thread_info.h b/arch/csky/include/asm/thread_info.h index b5ed788f0c68..9bc7a037c476 100644 --- a/arch/csky/include/asm/thread_info.h +++ b/arch/csky/include/asm/thread_info.h @@ -61,6 +61,7 @@ static inline struct thread_info *current_thread_info(void) #define TIF_SYSCALL_TRACEPOINT 5 /* syscall tracepoint instrumentation */ #define TIF_SYSCALL_AUDIT 6 /* syscall auditing */ #define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ +#define TIF_NOTIFY_IPI 8 /* Pending IPI on TIF_POLLLING idle CPU */ #define TIF_POLLING_NRFLAG 16 /* poll_idle() is TIF_NEED_RESCHED */ #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ #define TIF_RESTORE_SIGMASK 20 /* restore signal mask in do_signal() */ @@ -73,6 +74,7 @@ static inline struct thread_info *current_thread_info(void) #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) +#define _TIF_NOTIFY_IPI (1 << TIF_NOTIFY_IPI) #define _TIF_UPROBE (1 << TIF_UPROBE) #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) #define _TIF_MEMDIE (1 << TIF_MEMDIE)
Add support for TIF_NOTIFY_IPI on C-SKY. With TIF_NOTIFY_IPI, a sender sending an IPI to an idle CPU in TIF_POLLING mode will set the TIF_NOTIFY_IPI flag in the target's idle tasks's thread_info to pull the CPU out of idle, as opposed to setting TIF_NEED_RESCHED previously. This avoids spurious calls to schedule_idle() in cases where an IPI does not necessarily wake up a task on the idle CPU. Cc: Guo Ren <guoren@kernel.org> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Vincent Guittot <vincent.guittot@linaro.org> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Ben Segall <bsegall@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Daniel Bristot de Oliveira <bristot@redhat.com> Cc: Valentin Schneider <vschneid@redhat.com> Cc: K Prateek Nayak <kprateek.nayak@amd.com> Cc: linux-csky@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-pm@vger.kernel.org Signed-off-by: K Prateek Nayak <kprateek.nayak@amd.com> --- arch/csky/include/asm/thread_info.h | 2 ++ 1 file changed, 2 insertions(+)