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The pageset array can potentially acquire a huge amount of memory on large
NUMA systems. F.e. on a system with 512 processors and 256 nodes there
will be 256*512 pagesets. If each pageset only holds 5 pages then we are
talking about 655360 pages.With a 16K page size on IA64 this results in
potentially 10 Gigabytes of memory being trapped in pagesets. The typical
cases are much less for smaller systems but there is still the potential of
memory being trapped in off node pagesets. Off node memory may be rarely
used if local memory is available and so we may potentially have memory in
seldom used pagesets without this patch.
The slab allocator flushes its per cpu caches every 2 seconds. The
following patch flushes the off node pageset caches in the same way by
tying into the slab flush.
The patch also changes /proc/zoneinfo to include the number of pages
currently in each pageset.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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This is for use with slab users that pass a dynamically allocated slab name in
kmem_cache_create, so that before destroying the slab one can retrieve the name
and free its memory.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch changes calls to synchronize_kernel(), deprecated in the earlier
"Deprecate synchronize_kernel, GPL replacement" patch to instead call the new
synchronize_rcu() and synchronize_sched() APIs.
Signed-off-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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The patch makes the following function calls available to allocate memory
on a specific node without changing the basic operation of the slab
allocator:
kmem_cache_alloc_node(kmem_cache_t *cachep, unsigned int flags, int node);
kmalloc_node(size_t size, unsigned int flags, int node);
in a similar way to the existing node-blind functions:
kmem_cache_alloc(kmem_cache_t *cachep, unsigned int flags);
kmalloc(size, flags);
kmem_cache_alloc_node was changed to pass flags and the node information
through the existing layers of the slab allocator (which lead to some minor
rearrangements). The functions at the lowest layer (kmem_getpages,
cache_grow) are already node aware. Also __alloc_percpu can call
kmalloc_node now.
Performance measurements (using the pageset localization patch) yields:
w/o patches:
Tasks jobs/min jti jobs/min/task real cpu
1 484.27 100 484.2736 12.02 1.97 Wed Mar 30 20:50:43 2005
100 25170.83 91 251.7083 23.12 150.10 Wed Mar 30 20:51:06 2005
200 34601.66 84 173.0083 33.64 294.14 Wed Mar 30 20:51:40 2005
300 37154.47 86 123.8482 46.99 436.56 Wed Mar 30 20:52:28 2005
400 39839.82 80 99.5995 58.43 580.46 Wed Mar 30 20:53:27 2005
500 40036.32 79 80.0726 72.68 728.60 Wed Mar 30 20:54:40 2005
600 44074.21 79 73.4570 79.23 872.10 Wed Mar 30 20:55:59 2005
700 44016.60 78 62.8809 92.56 1015.84 Wed Mar 30 20:57:32 2005
800 40411.05 80 50.5138 115.22 1161.13 Wed Mar 30 20:59:28 2005
900 42298.56 79 46.9984 123.83 1303.42 Wed Mar 30 21:01:33 2005
1000 40955.05 80 40.9551 142.11 1441.92 Wed Mar 30 21:03:55 2005
with pageset localization and slab API patches:
Tasks jobs/min jti jobs/min/task real cpu
1 484.19 100 484.1930 12.02 1.98 Wed Mar 30 21:10:18 2005
100 27428.25 92 274.2825 21.22 149.79 Wed Mar 30 21:10:40 2005
200 37228.94 86 186.1447 31.27 293.49 Wed Mar 30 21:11:12 2005
300 41725.42 85 139.0847 41.84 434.10 Wed Mar 30 21:11:54 2005
400 43032.22 82 107.5805 54.10 582.06 Wed Mar 30 21:12:48 2005
500 42211.23 83 84.4225 68.94 722.61 Wed Mar 30 21:13:58 2005
600 40084.49 82 66.8075 87.12 873.11 Wed Mar 30 21:15:25 2005
700 44169.30 79 63.0990 92.24 1008.77 Wed Mar 30 21:16:58 2005
800 43097.94 79 53.8724 108.03 1155.88 Wed Mar 30 21:18:47 2005
900 41846.75 79 46.4964 125.17 1303.38 Wed Mar 30 21:20:52 2005
1000 40247.85 79 40.2478 144.60 1442.21 Wed Mar 30 21:23:17 2005
Signed-off-by: Christoph Lameter <christoph@lameter.com>
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
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