From: "H. Peter Anvin" <hpa@zytor.com>
To: Ulrich Drepper <drepper@redhat.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: hammer: MAP_32BIT
Date: Fri, 09 May 2003 15:21:25 -0700 [thread overview]
Message-ID: <3EBC29E5.3030002@zytor.com> (raw)
In-Reply-To: <3EBC29AD.5050203@redhat.com>
Ulrich Drepper wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> H. Peter Anvin wrote:
>
>>On the other
>>hand, how big of a performance issue is it really to call mmap() again
>>in the failure scenario *only*?
>
>
> Just look at the code, it's very expensive. In the moment the mmap code
> has to sequentially look at the VMAs in question. If it fails it means
> it walked the entire data structure without success. Ingo's patch does
> not address this, it just makes successful allocation usually fast again.
>
OK, maybe we should fix that instead :-/
-hpa
next prev parent reply other threads:[~2003-05-09 22:09 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-09 7:35 hammer: MAP_32BIT Ulrich Drepper
2003-05-09 9:20 ` Andi Kleen
2003-05-09 11:28 ` mikpe
2003-05-09 11:38 ` Andi Kleen
2003-05-09 11:52 ` mikpe
2003-05-09 12:16 ` Andi Kleen
2003-05-09 18:11 ` H. Peter Anvin
2003-05-09 19:24 ` Ulrich Drepper
2003-05-09 20:55 ` H. Peter Anvin
2003-05-09 21:45 ` Ulrich Drepper
2003-05-09 22:07 ` H. Peter Anvin
2003-05-09 22:20 ` Ulrich Drepper
2003-05-09 22:21 ` H. Peter Anvin [this message]
2003-05-09 22:20 ` Timothy Miller
2003-05-09 22:20 ` H. Peter Anvin
2003-05-09 22:46 ` Timothy Miller
2003-05-09 23:24 ` H. Peter Anvin
2003-05-13 14:25 ` Timothy Miller
2003-05-09 22:22 ` Ulrich Drepper
2003-05-09 22:53 ` Timothy Miller
2003-05-09 23:24 ` Ulrich Drepper
2003-05-10 0:00 ` Edgar Toernig
2003-05-10 0:58 ` Ulrich Drepper
2003-05-10 2:51 ` Edgar Toernig
2003-05-09 17:36 ` H. Peter Anvin
2003-05-09 17:39 ` Ulrich Drepper
2003-05-10 1:48 ` Andi Kleen
2003-05-10 20:10 ` David Woodhouse
2003-05-13 18:54 ` H. Peter Anvin
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