From: Paul Jackson <pj@sgi.com>
From: Paul Jackson <pj@sgi.com>
To: akpm@osdl.org
Cc: nickpiggin@yahoo.com.au, ak@suse.de, linux-mm@kvack.org,
holt@sgi.com, mbligh@google.com, rientjes@google.com,
rohitseth@google.com, menage@google.com,
Paul Jackson <pj@sgi.com>,
clameter@sgi.com
Subject: [PATCH] memory page_alloc zonelist caching speedup aligncache
Date: Wed, 18 Oct 2006 01:14:40 -0700 [thread overview]
Message-ID: <20061018081440.18477.10664.sendpatchset@sam.engr.sgi.com> (raw)
Avoid frequent writes to the zonelist zones[] array, which are
read-only after initial setup, by putting the zonelist_cache on
a separate cacheline.
Signed-off-by: Paul Jackson <pj@sgi.com>
---
include/linux/mmzone.h | 3 ++-
1 files changed, 2 insertions(+), 1 deletion(-)
--- 2.6.19-rc2-mm1.orig/include/linux/mmzone.h 2006-10-17 17:19:22.000000000 -0700
+++ 2.6.19-rc2-mm1/include/linux/mmzone.h 2006-10-17 17:31:31.000000000 -0700
@@ -396,7 +396,8 @@ struct zonelist {
struct zonelist_cache *zlcache_ptr; // NULL or &zlcache
struct zone *zones[MAX_ZONES_PER_ZONELIST + 1]; // NULL delimited
#ifdef CONFIG_NUMA
- struct zonelist_cache zlcache; // optional ...
+ /* Keep written zonelist_cache off read-only zones[] cache lines */
+ struct zonelist_cache zlcache ____cacheline_aligned; // optional ...
#endif
};
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.925.600.0401
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next reply other threads:[~2006-10-18 8:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-18 8:14 Paul Jackson, Paul Jackson [this message]
2006-10-18 15:35 ` Rohit Seth
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