From: Ulrich Drepper <drepper@redhat.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: hammer: MAP_32BIT
Date: Fri, 09 May 2003 15:20:29 -0700 [thread overview]
Message-ID: <3EBC29AD.5050203@redhat.com> (raw)
In-Reply-To: <3EBC26BF.2080709@zytor.com>
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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.
- --
- --------------. ,-. 444 Castro Street
Ulrich Drepper \ ,-----------------' \ Mountain View, CA 94041 USA
Red Hat `--' drepper at redhat.com `---------------------------
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next prev parent reply other threads:[~2003-05-09 22:08 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 [this message]
2003-05-09 22:21 ` H. Peter Anvin
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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