linux-kernel - Re: [PATCH 00/25] Vm Pageout Scalability Improvements (V8)

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Date:	Thu, 29 May 2008 13:16:24 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Lee Schermerhorn <lee.schermerhorn@...com>
Cc:	linux-kernel@...r.kernel.org, kosaki.motohiro@...fujitsu.com,
	eric.whitney@...com, linux-mm@...ck.org, npiggin@...e.de,
	riel@...hat.com
Subject: Re: [PATCH 00/25] Vm Pageout Scalability Improvements (V8) -
 continued

On Thu, 29 May 2008 15:50:30 -0400
Lee Schermerhorn <lee.schermerhorn@...com> wrote:

> 
> The patches to follow are a continuation of the V8 "VM pageout scalability
> improvements" series that Rik van Riel posted to LKML on 23May08.  These
> patches apply atop Rik's series with the following overlap:
> 
> Patches 13 through 16 replace the corresponding patches in Rik's posting.
> 
> Patch 13, the noreclaim lru infrastructure, now includes Kosaki Motohiro's
> memcontrol enhancements to track nonreclaimable pages.
> 
> Patches 14 and 15 are largely unchanged, except for refresh.  Includes
> some minor statistics formatting cleanup.
> 
> Patch 16 includes a fix for an potential [unobserved] race condition during
> SHM_UNLOCK.
> 

<head spins a bit>

> 
> Additional patches in this series:
> 
> Patches 17 through 20 keep mlocked pages off the normal [in]active LRU
> lists using the noreclaim lru infrastructure.   These patches represent
> a fairly significant rework of an RFC patch originally posted by Nick Piggin.
> 
> Patches 21 and 22 are optional, but recommended, enhancements to the overall
> noreclaim series.  
> 
> Patches 23 and 24 are optional enhancements useful during debug and testing.
> 
> Patch 25 is a rather verbose document describing the noreclaim lru
> infrastructure and the use thereof to keep ramfs, SHM_LOCKED and mlocked
> pages off the normal LRU lists.
> 
> ---
> 
> The entire stack, including Rik's split lru patches, are holding up very
> well under stress loads.  E.g., ran for over 90+ hours over the weekend on
> both x86_64 [32GB, 8core] and ia64 [32GB, 16cpu] platforms without error
> over last weekend.  
> 
> I think these are ready for a spin in -mm atop Rik's patches.

I was >this< close to getting onto Rik's patches (honest) but a few
other people have been kicking the tyres and seem to have caused some
punctures so I'm expecting V9?
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