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authorRaghavendra K T <raghavendra.kt@linux.vnet.ibm.com>2014-04-03 14:48:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-03 16:21:05 -0700
commit6d2be915e589b58cb11418cbe1f22ff90732b6ac (patch)
tree2ee1914fffc6ab056f5b8c958cfa69f506327024 /mm/readahead.c
parent421af243b1a5ec2fe62f070d3b84d925301cc008 (diff)
downloadop-kernel-dev-6d2be915e589b58cb11418cbe1f22ff90732b6ac.zip
op-kernel-dev-6d2be915e589b58cb11418cbe1f22ff90732b6ac.tar.gz
mm/readahead.c: fix readahead failure for memoryless NUMA nodes and limit readahead pages
Currently max_sane_readahead() returns zero on the cpu whose NUMA node has no local memory which leads to readahead failure. Fix this readahead failure by returning minimum of (requested pages, 512). Users running applications on a memory-less cpu which needs readahead such as streaming application see considerable boost in the performance. Result: fadvise experiment with FADV_WILLNEED on a PPC machine having memoryless CPU with 1GB testfile (12 iterations) yielded around 46.66% improvement. fadvise experiment with FADV_WILLNEED on a x240 machine with 1GB testfile 32GB* 4G RAM numa machine (12 iterations) showed no impact on the normal NUMA cases w/ patch. Kernel Avg Stddev base 7.4975 3.92% patched 7.4174 3.26% [Andrew: making return value PAGE_SIZE independent] Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Acked-by: Jan Kara <jack@suse.cz> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/readahead.c')
-rw-r--r--mm/readahead.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/readahead.c b/mm/readahead.c
index 62c500a..29c5e1a 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -233,14 +233,14 @@ int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
return 0;
}
+#define MAX_READAHEAD ((512*4096)/PAGE_CACHE_SIZE)
/*
* Given a desired number of PAGE_CACHE_SIZE readahead pages, return a
* sensible upper limit.
*/
unsigned long max_sane_readahead(unsigned long nr)
{
- return min(nr, (node_page_state(numa_node_id(), NR_INACTIVE_FILE)
- + node_page_state(numa_node_id(), NR_FREE_PAGES)) / 2);
+ return min(nr, MAX_READAHEAD);
}
/*
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