From: Ingo Molnar <mingo@elte.hu>
To: Matt Mackall <mpm@selenic.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: [patch -mm] fix SLOB on x64
Date: Sun, 11 Dec 2005 21:02:03 +0100 [thread overview]
Message-ID: <20051211200203.GA19322@elte.hu> (raw)
In-Reply-To: <20051211180551.GW8637@waste.org>
* Matt Mackall <mpm@selenic.com> wrote:
> On Sun, Dec 11, 2005 at 03:12:17PM +0100, Ingo Molnar wrote:
> >
> > this patch fixes 32-bitness bugs in mm/slob.c. Successfully booted x64
> > with SLOB enabled. (i have switched the PREEMPT_RT feature to use the
> > SLOB allocator exclusively, so it must work on all platforms)
>
> The patch looks fine, but what's this about using SLOB exclusively?
> Fragmentation performance of SLOB is miserable on anything like a
> modern desktop, I think SLOB only makes sense for small machines. The
> locking also suggests dual core at most.
well, this is only an -rt artifact: the SLOB needs zero modifications to
work on PREEMPT_RT, while SLAB needed a risky 66K monster patch. Until
someone simplifies the SLAB conversion to PREEMPT_RT, i'll use the SLOB.
i havent noticed any significant slowdown due to the SLOB. In any case,
we'll give it some workout which should further speed up its upstream
integration - it's looking good so far.
Ingo
prev parent reply other threads:[~2005-12-11 20:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-11 14:12 [patch -mm] fix SLOB on x64 Ingo Molnar
2005-12-11 17:22 ` Ed Tomlinson
2005-12-11 20:05 ` Ingo Molnar
2005-12-11 18:05 ` Matt Mackall
2005-12-11 20:02 ` Ingo Molnar [this message]
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