From: "H. Peter Anvin" <hpa@zytor.com>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Ingo Molnar <mingo@elte.hu>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
"Frank Ch. Eigler" <fche@redhat.com>
Subject: Re: [patch 0/2] Immediate Values - jump patching update
Date: Sun, 04 May 2008 14:05:26 -0700 [thread overview]
Message-ID: <481E2516.7070600@zytor.com> (raw)
In-Reply-To: <20080504145430.GA23137@Krystal>
Mathieu Desnoyers wrote:
>
> Following your own suggestion, why don't we fix gcc and make it
> interleave unlikely blocks less heavily with hot blocks ?
>
Doing this with compiler support is definitely The Right Thing, so I
think this is the best way.
>> Furthermore, modern CPUs often speculatively fetch *both*
>> branches of a conditional.
>>
>> This is actually the biggest motivation for patching static branches.
>
> Agreed. I'd like to find some info about which microarchitectures you
> have in mind. Intel Core 2 ?
Not sure about Core 2, although Core 2 definitely can track down the
wrong branch on a mispredict.
> Let's fix gcc ! ;)
Sounds great :)
-hpa
prev parent reply other threads:[~2008-05-04 21:09 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-28 3:34 [patch 0/2] Immediate Values - jump patching update Mathieu Desnoyers
2008-04-28 3:34 ` [patch 1/2] Immediate Values - jump liveliness Mathieu Desnoyers
2008-04-28 3:34 ` [patch 2/2] Markers - use imv_cond " Mathieu Desnoyers
2008-04-28 12:48 ` [patch 0/2] Immediate Values - jump patching update Ingo Molnar
2008-04-28 14:35 ` Mathieu Desnoyers
2008-04-28 17:21 ` H. Peter Anvin
2008-04-28 20:25 ` Ingo Molnar
2008-04-28 21:03 ` H. Peter Anvin
2008-04-28 22:11 ` Ingo Molnar
2008-04-28 22:25 ` H. Peter Anvin
2008-04-28 22:44 ` Ingo Molnar
2008-04-28 23:06 ` H. Peter Anvin
2008-04-29 0:47 ` Frank Ch. Eigler
2008-04-29 1:08 ` H. Peter Anvin
2008-04-29 12:08 ` Ingo Molnar
2008-05-14 14:53 ` Pavel Machek
2008-04-29 1:46 ` Mathieu Desnoyers
2008-04-29 2:07 ` H. Peter Anvin
2008-04-29 12:18 ` Mathieu Desnoyers
2008-04-29 15:35 ` H. Peter Anvin
2008-05-04 14:54 ` Mathieu Desnoyers
2008-05-04 21:05 ` H. Peter Anvin [this message]
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