From: Nick Piggin <npiggin@suse.de>
To: Ingo Molnar <mingo@elte.hu>,
linux-arch@vger.kernel.org, linuxppc-dev@ozlabs.org,
paulus@samba.org, benh@kernel.crashing.org
Subject: Re: [patch] powerpc: implement optimised mutex fastpaths
Date: Mon, 13 Oct 2008 03:18:27 +0200 [thread overview]
Message-ID: <20081013011827.GA1299@wotan.suse.de> (raw)
In-Reply-To: <20081012054732.GB12535@wotan.suse.de>
On Sun, Oct 12, 2008 at 07:47:32AM +0200, Nick Piggin wrote:
>
> Implement a more optimal mutex fastpath for powerpc, making use of acquire
> and release barrier semantics. This takes the mutex lock+unlock benchmark
> from 203 to 173 cycles on a G5.
>
> +static inline int
> +__mutex_fastpath_trylock(atomic_t *count, int (*fail_fn)(atomic_t *))
> +{
> + if (likely(__mutex_cmpxchg_lock(count, 1, 0) == 1))
> + return 1;
Oops, I must have sent the wrong version. This needs a return 0 here.
> +}
next prev parent reply other threads:[~2008-10-13 1:18 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-12 5:46 [patch] mutex: optimise generic mutex implementations Nick Piggin
2008-10-12 5:47 ` [patch] powerpc: implement optimised mutex fastpaths Nick Piggin
2008-10-13 1:18 ` Nick Piggin [this message]
2008-11-06 4:09 ` Paul Mackerras
2008-11-06 5:06 ` Nick Piggin
2008-10-13 16:15 ` Scott Wood
2008-10-13 16:20 ` Scott Wood
2008-10-14 7:06 ` Nick Piggin
2008-10-14 8:35 ` [patch] mutex: optimise generic mutex implementations Benjamin Herrenschmidt
2008-10-22 15:59 ` Ingo Molnar
2008-10-23 4:43 ` Benjamin Herrenschmidt
2008-10-23 7:02 ` Nick Piggin
2008-10-22 16:24 ` David Howells
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