From: Steven Rostedt <rostedt@goodmis.org>
To: Christoph Lameter <cl@linux.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Jesper Dangaard Brouer <brouer@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v2 1/2] mm/slub: optimize alloc/free fastpath by removing preemption on/off
Date: Thu, 15 Jan 2015 23:07:49 -0500 [thread overview]
Message-ID: <20150115230749.5d73ad49@grimm.local.home> (raw)
In-Reply-To: <alpine.DEB.2.11.1501152155480.14236@gentwo.org>
On Thu, 15 Jan 2015 21:57:58 -0600 (CST)
Christoph Lameter <cl@linux.com> wrote:
> > I get:
> >
> > mov %gs:0x18(%rax),%rdx
> >
> > Looks to me that %gs is used.
>
> %gs is used as a segment prefix. That does not add significant cycles.
> Retrieving the content of %gs and loading it into another register
> would be expensive in terms of cpu cycles.
OK, maybe that's what I saw in my previous benchmarks. Again, that was
a while ago.
-- Steve
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next prev parent reply other threads:[~2015-01-16 4:07 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-15 7:40 Joonsoo Kim
2015-01-15 7:40 ` [PATCH v2 2/2] mm: don't use compound_head() in virt_to_head_page() Joonsoo Kim
2015-01-16 1:16 ` Andrew Morton
2015-01-16 3:30 ` Christoph Lameter
2015-01-19 4:20 ` 答复: " Zhang, Yanfei
2015-01-19 6:16 ` Joonsoo Kim
2015-01-15 8:10 ` [PATCH v2 1/2] mm/slub: optimize alloc/free fastpath by removing preemption on/off Jesper Dangaard Brouer
2015-01-16 1:16 ` Andrew Morton
2015-01-16 1:30 ` Steven Rostedt
2015-01-16 3:27 ` Christoph Lameter
2015-01-16 3:51 ` Steven Rostedt
2015-01-16 3:57 ` Christoph Lameter
2015-01-16 4:07 ` Steven Rostedt [this message]
2015-01-16 13:40 ` Eric Dumazet
2015-01-16 16:37 ` Steven Rostedt
2015-01-16 4:04 ` Steven Rostedt
2015-01-16 3:28 ` Christoph Lameter
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