From: Ingo Molnar <mingo@elte.hu>
To: Frank Mayhar <fmayhar@google.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
Roland McGrath <roland@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Alexey Dobriyan <adobriyan@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Oleg Nesterov <oleg@tv-sign.ru>
Subject: Re: [PATCH 2.6.27-rc5 resubmit] Fix itimer/many thread hang.
Date: Tue, 16 Sep 2008 10:41:43 +0200 [thread overview]
Message-ID: <20080916084143.GC17287@elte.hu> (raw)
In-Reply-To: <1221502142.19012.35.camel@bobble.smo.corp.google.com>
* Frank Mayhar <fmayhar@google.com> wrote:
> > the wider question is, shouldnt the UP case be just the same as the
> > SMP case? Especially the type assymetry struct thread_group_cputime
> > looks ugly. (and assymetries like that tend to be a constant source
> > of breakage like the one below.)
>
> I'm not overly fond of this one, either; I did it at Roland's
> suggestion (it's all _his_ fault, yeah, _that's_ the ticket! :-); his
> opinion IIRC was that the UP case will perform better without the
> extra pointer dereferences. I agree that it's a potential source of
> pain such as the one you point out.
i dont know ...
lets try that simplification as a delta patch, ok? Please check the
before/after size of 'vmlinux' in a 'make defconfig' [with SMP disabled
after make defconfig] UP build. If there's visible size difference then
Roland's point holds.
Ingo
next prev parent reply other threads:[~2008-09-16 8:42 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-12 16:54 [PATCH 2.6.27-rc5 resubmit] Fix itimer/many thread hang Frank Mayhar
2008-09-12 20:27 ` Andrew Morton
2008-09-14 15:06 ` Ingo Molnar
2008-09-14 15:07 ` [PATCH] timers: fix itimer/many thread hang, fix Ingo Molnar
2008-09-14 15:09 ` [PATCH 2.6.27-rc5 resubmit] Fix itimer/many thread hang Ingo Molnar
2008-09-15 18:09 ` Frank Mayhar
2008-09-16 8:41 ` Ingo Molnar [this message]
2008-09-17 19:03 ` Frank Mayhar
2008-09-17 19:13 ` Roland McGrath
2008-09-17 20:12 ` Frank Mayhar
2008-09-18 10:23 ` Ingo Molnar
2008-09-18 13:50 ` Frank Mayhar
2008-09-22 20:22 ` [PATCH 2.6.27-rc5 re-resubmit] " Frank Mayhar
2008-09-23 11:40 ` Ingo Molnar
2008-09-23 12:52 ` [boot crash] " Ingo Molnar
2008-09-23 13:59 ` Oleg Nesterov
2008-09-23 16:09 ` Frank Mayhar
2008-09-23 22:56 ` Frank Mayhar
2008-09-24 21:23 ` [PATCH 2.6.27-rc5 incremental " Frank Mayhar
2008-09-27 18:08 ` Ingo Molnar
2008-09-30 6:33 ` Ingo Molnar
2008-09-30 16:36 ` Frank Mayhar
2008-10-01 16:20 ` Frank Mayhar
2008-10-02 9:43 ` Ingo Molnar
2008-09-14 15:12 ` [PATCH 2.6.27-rc5 resubmit] " Ingo Molnar
2008-09-14 15:14 ` Ingo Molnar
2008-09-14 19:31 ` Roland McGrath
2008-09-15 6:41 ` Ingo Molnar
2008-09-15 17:59 ` Frank Mayhar
2008-09-16 8:39 ` Ingo Molnar
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