From: Ken Moffat <zarniwhoop@ntlworld.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: linux-kernel@vger.kernel.org,
"Jeff Epler" <jepler@unpythonic.net>,
"Frédéric Weisbecker" <fweisbec@gmail.com>,
"Rik van Riel" <riel@redhat.com>
Subject: Re: CONFIG_NO_HZ_FULL restricts cpu usage to the equivalent of one in 4.2
Date: Thu, 16 Jul 2015 01:34:19 +0100 [thread overview]
Message-ID: <20150716003419.GB15221@milliways> (raw)
In-Reply-To: <55A6AEE1.4080109@amacapital.net>
On Wed, Jul 15, 2015 at 12:05:05PM -0700, Andy Lutomirski wrote:
>
> Before going nuts bisecting, it could be worth running perf record -a -g -e
> cycles (or perhaps -e task-clock instead of -e cycles). It could also be
> worth manually sampling /proc/PID/stack a few times for a process that isn't
> making as much progress as it should.
>
> --Andy
I think Frederic has already spotted the problem - in the early
bisects, everything was building on CPU 0. But thanks for the
suggestion.
ĸen
--
This one goes up to eleven!
next prev parent reply other threads:[~2015-07-16 0:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-15 16:27 CONFIG_NO_HZ_FULL restricts cpu usage to the equivalent of one in 4.2 Ken Moffat
2015-07-15 19:05 ` Andy Lutomirski
2015-07-16 0:34 ` Ken Moffat [this message]
2015-07-15 19:11 ` Frederic Weisbecker
2015-07-16 0:32 ` Ken Moffat
2015-07-18 13:26 ` Frederic Weisbecker
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