From: Andrea Arcangeli <andrea@suse.de>
To: Peter Zaitsev <pz@spylog.ru>
Cc: Andrew Morton <akpm@zip.com.au>,
theowl@freemail.c3.hu, theowl@freemail.hu,
linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@transmeta.com>
Subject: Re: your mail on mmap() to the kernel list
Date: Wed, 5 Dec 2001 17:23:23 +0100 [thread overview]
Message-ID: <20011205172323.C6125@athlon.random> (raw)
In-Reply-To: <3C082244.8587.80EF082@localhost>, <3C082244.8587.80EF082@localhost> <61437219298.20011201113130@spylog.ru> <3C08A4BD.1F737E36@zip.com.au> <20011204151549.U3447@athlon.random> <16498470022.20011204183624@spylog.ru> <20011204174824.D3447@athlon.random> <41187009255.20011205191203@spylog.ru>
In-Reply-To: <41187009255.20011205191203@spylog.ru>; from pz@spylog.ru on Wed, Dec 05, 2001 at 07:12:03PM +0300
On Wed, Dec 05, 2001 at 07:12:03PM +0300, Peter Zaitsev wrote:
> I understand it but does it start so search standard way from the low
> addresses or it looks it above the hint address before looking at
> lower addresses ?
mmap(2) with a "valid" hint (so with enough space in the hole between
'start' and 'start+len') runs with O(log(N)) complexity because it uses
the tree internally to verify that's a valid hole. It's only the search
of an hole that has O(N) complexity, the "check" of one hole has just
O(log(N)) complexity.
Andrea
prev parent reply other threads:[~2001-12-05 16:24 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3C082244.8587.80EF082@localhost>
2001-12-01 8:31 ` Re[2]: your mail on mmap() to the kernel list Peter Zaitsev
2001-12-01 9:37 ` Andrew Morton
2001-12-02 23:07 ` Re[2]: " Peter Zaitsev
2001-12-02 23:34 ` Andrew Morton
2001-12-03 10:10 ` Re[2]: " Peter Zaitsev
2001-12-04 14:18 ` Andrea Arcangeli
2001-12-04 14:15 ` Andrea Arcangeli
2001-12-04 15:36 ` Re[2]: " Peter Zaitsev
2001-12-04 16:42 ` Rik van Riel
2001-12-04 16:55 ` Andrea Arcangeli
2001-12-05 14:38 ` Re[2]: " Peter Zaitsev
2001-12-05 14:36 ` Re[3]: " Peter Zaitsev
2001-12-04 16:48 ` Andrea Arcangeli
2001-12-05 16:12 ` Re[2]: " Peter Zaitsev
2001-12-05 16:23 ` Andrea Arcangeli [this message]
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