From: Peter Zijlstra <peterz@infradead.org>
To: Jean-Michel Hautbois <jhautbois@gmail.com>
Cc: Darren Hart <dvhart@linux.intel.com>, linux-rt-users@vger.kernel.org
Subject: Re: Slub support with PREEMPT_RT ?
Date: Thu, 18 Nov 2010 12:04:38 +0100 [thread overview]
Message-ID: <1290078278.2109.1327.camel@laptop> (raw)
In-Reply-To: <AANLkTikV5Jykyv4+SBcJQqMvzMSUsXOUdXTQU5rOhcs_@mail.gmail.com>
On Thu, 2010-11-18 at 09:59 +0100, Jean-Michel Hautbois wrote:
>
> My real question is the impact of SLUB compared to SLAB on the
> determinism of kmalloc usage and all caches.
> I did some tests using SLUB instead of SLAB on a small (MPC5200 /
> 400Mhz / 16k i-cache and 16k d-cache), and slub seems to be better.
> But I don't know if there is a possibility to tune SLAB in order to
> get good results.
That's a pretty pointless idea, non of them are deterministic allocators
-- nor can they be, page allocation involves the whole vm reclaim path.
If you want determinism don't allocate memory.
prev parent reply other threads:[~2010-11-18 11:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-17 16:18 Slub support with PREEMPT_RT ? Jean-Michel Hautbois
2010-11-18 1:23 ` Darren Hart
2010-11-18 8:40 ` Peter Zijlstra
2010-11-18 8:59 ` Jean-Michel Hautbois
2010-11-18 11:04 ` Peter Zijlstra [this message]
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