From: Frederic Weisbecker <fweisbec@gmail.com>
To: George Spelvin <linux@horizon.com>
Cc: jason.low2@hp.com, mingo@kernel.org, peterz@infradead.org,
tglx@linutronix.de, akpm@linux-foundation.org, dave@stgolabs.net,
hideaki.kimura@hpe.com, linux-kernel@vger.kernel.org,
oleg@redhat.com, paulmck@linux.vnet.ibm.com, rostedt@goodmis.org,
scott.norton@hpe.com, terry.rudd@hpe.com
Subject: Re: [PATCH v2 0/4] timer: Improve itimers scalability
Date: Thu, 15 Oct 2015 14:30:21 +0200 [thread overview]
Message-ID: <20151015123018.GA12822@lerouge> (raw)
In-Reply-To: <20151014211827.739.qmail@ns.horizon.com>
On Wed, Oct 14, 2015 at 05:18:27PM -0400, George Spelvin wrote:
> I'm going to give 4/4 a closer look to see if the races with timer
> expiration make more sense to me than last time around.
> (E.g. do CPU time signals even work in CONFIG_NO_HZ_FULL?)
Those enqueued with timer_settime() do work. But itimers,
and rlimits (RLIMIT_RTTIME, RLIMIT_CPU) aren't supported well. I
need to rework that.
>
> But although I haven't yet convinced myself the current code is right,
> the changes don't seem to make it any worse. So consider all four
>
> Reviewed-by: George Spelvin <linux@horizon.com>
>
> Thank you!
next prev parent reply other threads:[~2015-10-15 12:30 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-14 19:07 [PATCH v2 0/4] timer: Improve itimers scalability Jason Low
2015-10-14 19:07 ` [PATCH v2 1/4] timer: Optimize fastpath_timer_check() Jason Low
2015-10-15 9:27 ` [tip:timers/core] posix_cpu_timer: Optimize fastpath_timer_check( ) tip-bot for Jason Low
2015-10-14 19:07 ` [PATCH v2 2/4] timer: Check thread timers only when there are active thread timers Jason Low
2015-10-15 9:28 ` [tip:timers/core] posix_cpu_timer: " tip-bot for Jason Low
2015-10-14 19:07 ` [PATCH v2 3/4] timer: Convert cputimer->running to bool Jason Low
2015-10-15 9:28 ` [tip:timers/core] posix_cpu_timer: Convert cputimer-> running " tip-bot for Jason Low
2015-10-14 19:07 ` [PATCH v2 4/4] timer: Reduce unnecessary sighand lock contention Jason Low
2015-10-15 9:28 ` [tip:timers/core] posix_cpu_timer: " tip-bot for Jason Low
2015-10-14 21:18 ` [PATCH v2 0/4] timer: Improve itimers scalability George Spelvin
2015-10-15 12:30 ` Frederic Weisbecker [this message]
2015-10-15 19:00 ` Jason Low
2015-10-15 8:47 ` Ingo Molnar
2015-10-15 19:01 ` Jason Low
2015-10-16 7:12 ` Ingo Molnar
2015-10-16 17:34 ` Jason Low
2015-10-16 17:46 ` Hideaki Kimura
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