From: Andi Kleen <ak@suse.de>
To: Christoph Lameter <clameter@sgi.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
"Paul E. McKenney" <paulmck@us.ibm.com>,
linux-mm@kvack.org, akpm@linux-foundation.org, nacc@us.ibm.com
Subject: Re: [PATCH/RFC 0/11] Shared Policy Overview
Date: Thu, 28 Jun 2007 00:01:16 +0200 [thread overview]
Message-ID: <200706280001.16383.ak@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.64.0706271427400.31227@schroedinger.engr.sgi.com>
> The zonelist from MPOL_BIND is passed to __alloc_pages. As a result the
> RCU lock must be held over the call into the page allocator with reclaim
> etc etc. Note that the zonelist is part of the policy structure.
Yes I realized this at some point too. RCU doesn't work here because
__alloc_pages can sleep. Have to use the reference counts even though
it adds atomic operations.
> I think one prerequisite to memory policy uses like this is work out how a
> memory policy can be handled by the page allocator in such a way that
>
> 1. The use is lightweight and does not impact performance.
The current mempolicies are all lightweight and zero cost in the main
allocator path.
The only outlier is still cpusets which does strange stuff, but you
can't blame mempolicies for that.
-Andi
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next prev parent reply other threads:[~2007-06-27 22:01 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-25 19:52 Lee Schermerhorn
2007-06-25 19:52 ` [PATCH/RFC 1/11] Shared Policy: move shared policy to inode/mapping Lee Schermerhorn
2007-06-25 19:52 ` [PATCH/RFC 2/11] Shared Policy: allocate shared policies as needed Lee Schermerhorn
2007-06-25 19:52 ` [PATCH/RFC 3/11] Shared Policy: let vma policy ops handle sub-vma policies Lee Schermerhorn
2007-06-25 19:52 ` [PATCH/RFC 4/11] Shared Policy: fix show_numa_maps() Lee Schermerhorn
2007-06-25 19:52 ` [PATCH/RFC 5/11] Shared Policy: Add hugepage shmem policy vm_ops Lee Schermerhorn
2007-06-25 19:53 ` [PATCH/RFC 6/11] Shared Policy: Factor alloc_page_pol routine Lee Schermerhorn
2007-06-25 19:53 ` [PATCH/RFC 7/11] Shared Policy: use shared policy for page cache allocations Lee Schermerhorn
2007-06-25 19:53 ` [PATCH/RFC 8/11] Shared Policy: fix migration of private mappings Lee Schermerhorn
2007-06-25 19:53 ` [PATCH/RFC 9/11] Shared Policy: mapped file policy persistence model Lee Schermerhorn
2007-06-25 19:53 ` [PATCH/RFC 10/11] Shared Policy: per cpuset shared file policy control Lee Schermerhorn
2007-06-25 21:10 ` Paul Jackson
2007-06-27 17:33 ` Lee Schermerhorn
2007-06-27 19:52 ` Paul Jackson
2007-06-27 20:22 ` Lee Schermerhorn
2007-06-27 20:36 ` Paul Jackson
2007-06-25 19:53 ` [PATCH/RFC 11/11] Shared Policy: add generic file set/get policy vm ops Lee Schermerhorn
2007-06-26 22:17 ` [PATCH/RFC 0/11] Shared Policy Overview Christoph Lameter
2007-06-27 13:43 ` Lee Schermerhorn
2007-06-26 22:21 ` Christoph Lameter
2007-06-26 22:42 ` Andi Kleen
2007-06-27 3:25 ` Christoph Lameter
2007-06-27 20:14 ` Lee Schermerhorn
2007-06-27 18:14 ` Lee Schermerhorn
2007-06-27 21:37 ` Christoph Lameter
2007-06-27 22:01 ` Andi Kleen [this message]
2007-06-27 22:08 ` Christoph Lameter
2007-06-27 23:46 ` Paul E. McKenney
2007-06-28 0:14 ` Andi Kleen
2007-06-29 21:47 ` Lee Schermerhorn
2007-06-28 13:42 ` Lee Schermerhorn
2007-06-28 22:02 ` Andi Kleen
2007-06-29 17:14 ` Lee Schermerhorn
2007-06-29 17:42 ` Andi Kleen
2007-06-30 18:34 ` [PATCH/RFC] Fix Mempolicy Ref Counts - was " Lee Schermerhorn
2007-07-03 18:09 ` Christoph Lameter
2007-06-29 1:39 ` Christoph Lameter
2007-06-29 9:01 ` Andi Kleen
2007-06-29 14:05 ` Christoph Lameter
2007-06-29 17:41 ` Lee Schermerhorn
2007-06-29 20:15 ` Christoph Lameter
2007-06-29 13:22 ` Lee Schermerhorn
2007-06-29 14:18 ` Christoph Lameter
2007-06-27 23:36 ` Lee Schermerhorn
2007-06-29 1:41 ` Christoph Lameter
2007-06-29 13:30 ` Lee Schermerhorn
2007-06-29 14:20 ` Andi Kleen
2007-06-29 21:40 ` Lee Schermerhorn
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