From: "Martin K. Petersen" <mkp@wildopensource.com>
To: Andi Kleen <ak@suse.de>
Cc: linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org,
akpm@osdl.org, tony.luck@intel.com
Subject: Re: [PATCH] General purpose zeroed page slab
Date: Mon, 18 Oct 2004 18:06:45 +0000 [thread overview]
Message-ID: <yq1ekjvrjd6.fsf@wilson.mkp.net> (raw)
In-Reply-To: <20041014180427.GA7973@wotan.suse.de> (Andi Kleen's message of "Thu, 14 Oct 2004 20:04:27 +0200")
>>>>> "Andi" = Andi Kleen <ak@suse.de> writes:
[Sorry about dropping off of the planet for a couple of days. Had to
deal with some water damage on the house :/]
Andi> The means every user has to memset it to zero before free. Add
Andi> a comment for that at least.
Andi> Also that's pretty dumb. How about keeping track how much of the
Andi> page got non zeroed (e.g. by using a few free words in struct
Andi> page for a coarse grained dirty bitmap)
Andi> Then you could memset on free only the parts that got actually
Andi> changed, and never waste cache lines for anything else.
Ayup. I'll ponder this a bit. For now I think I'm going to leave the
page table cache stuff as is and make the general purpose slab a
separate project. It'll be easy to switch the page tables over later.
--
Martin K. Petersen Wild Open Source, Inc.
mkp@wildopensource.com http://www.wildopensource.com/
WARNING: multiple messages have this Message-ID (diff)
From: "Martin K. Petersen" <mkp@wildopensource.com>
To: Andi Kleen <ak@suse.de>
Cc: linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org,
akpm@osdl.org, tony.luck@intel.com
Subject: Re: [PATCH] General purpose zeroed page slab
Date: Mon, 18 Oct 2004 14:06:45 -0400 [thread overview]
Message-ID: <yq1ekjvrjd6.fsf@wilson.mkp.net> (raw)
In-Reply-To: <20041014180427.GA7973@wotan.suse.de> (Andi Kleen's message of "Thu, 14 Oct 2004 20:04:27 +0200")
>>>>> "Andi" == Andi Kleen <ak@suse.de> writes:
[Sorry about dropping off of the planet for a couple of days. Had to
deal with some water damage on the house :/]
Andi> The means every user has to memset it to zero before free. Add
Andi> a comment for that at least.
Andi> Also that's pretty dumb. How about keeping track how much of the
Andi> page got non zeroed (e.g. by using a few free words in struct
Andi> page for a coarse grained dirty bitmap)
Andi> Then you could memset on free only the parts that got actually
Andi> changed, and never waste cache lines for anything else.
Ayup. I'll ponder this a bit. For now I think I'm going to leave the
page table cache stuff as is and make the general purpose slab a
separate project. It'll be easy to switch the page tables over later.
--
Martin K. Petersen Wild Open Source, Inc.
mkp@wildopensource.com http://www.wildopensource.com/
next prev parent reply other threads:[~2004-10-18 18:06 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-14 16:50 [PATCH] General purpose zeroed page slab Martin K. Petersen
2004-10-14 16:50 ` Martin K. Petersen
2004-10-14 17:30 ` Brian Gerst
2004-10-14 17:30 ` Brian Gerst
2004-10-14 17:36 ` Matthew Wilcox
2004-10-14 17:36 ` Matthew Wilcox
2004-10-14 18:49 ` Dave Jones
2004-10-14 18:49 ` Dave Jones
2004-10-14 19:08 ` Denis Vlasenko
2004-10-14 19:08 ` Denis Vlasenko
2004-10-14 19:47 ` Matthew Wilcox
2004-10-14 19:47 ` Matthew Wilcox
2004-10-14 18:04 ` Andi Kleen
2004-10-14 18:04 ` Andi Kleen
2004-10-14 23:36 ` Adam Heath
2004-10-14 23:36 ` Adam Heath
2004-10-15 1:18 ` Andi Kleen
2004-10-15 1:18 ` Andi Kleen
2004-10-18 18:06 ` Martin K. Petersen [this message]
2004-10-18 18:06 ` Martin K. Petersen
2004-10-18 18:42 ` Matthew Wilcox
2004-10-18 18:42 ` Matthew Wilcox
2004-10-18 18:54 ` Martin K. Petersen
2004-10-18 18:54 ` Martin K. Petersen
2004-10-18 19:06 ` Andi Kleen
2004-10-18 19:06 ` Andi Kleen
2004-10-18 21:06 ` Andi Kleen
2004-10-18 21:06 ` Andi Kleen
2004-10-18 19:03 ` Luck, Tony
2004-10-18 19:03 ` Luck, Tony
2004-10-18 19:14 ` Matthew Wilcox
2004-10-18 19:14 ` Matthew Wilcox
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