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authorDavid Rientjes <rientjes@google.com>2011-03-22 16:30:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-22 17:44:01 -0700
commitddd588b5dd55f14320379961e47683db4e4c1d90 (patch)
tree09de73c51c8c5e701e644236890a5d205ec3cdc9 /lib/show_mem.c
parent94dcf29a11b3d20a28790598d701f98484a969da (diff)
downloadlinux-linaro-precise-ddd588b5dd55f14320379961e47683db4e4c1d90.tar.gz
oom: suppress nodes that are not allowed from meminfo on oom kill
The oom killer is extremely verbose for machines with a large number of cpus and/or nodes. This verbosity can often be harmful if it causes other important messages to be scrolled from the kernel log and incurs a signicant time delay, specifically for kernels with CONFIG_NODES_SHIFT > 8. This patch causes only memory information to be displayed for nodes that are allowed by current's cpuset when dumping the VM state. Information for all other nodes is irrelevant to the oom condition; we don't care if there's an abundance of memory elsewhere if we can't access it. This only affects the behavior of dumping memory information when an oom is triggered. Other dumps, such as for sysrq+m, still display the unfiltered form when using the existing show_mem() interface. Additionally, the per-cpu pageset statistics are extremely verbose in oom killer output, so it is now suppressed. This removes nodes_weight(current->mems_allowed) * (1 + nr_cpus) lines from the oom killer output. Callers may use __show_mem(SHOW_MEM_FILTER_NODES) to filter disallowed nodes. Signed-off-by: David Rientjes <rientjes@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/show_mem.c')
-rw-r--r--lib/show_mem.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/show_mem.c b/lib/show_mem.c
index fdc77c82f92..d8d602b58c3 100644
--- a/lib/show_mem.c
+++ b/lib/show_mem.c
@@ -9,14 +9,14 @@
#include <linux/nmi.h>
#include <linux/quicklist.h>
-void show_mem(void)
+void __show_mem(unsigned int filter)
{
pg_data_t *pgdat;
unsigned long total = 0, reserved = 0, shared = 0,
nonshared = 0, highmem = 0;
printk("Mem-Info:\n");
- show_free_areas();
+ __show_free_areas(filter);
for_each_online_pgdat(pgdat) {
unsigned long i, flags;
@@ -61,3 +61,8 @@ void show_mem(void)
quicklist_total_size());
#endif
}
+
+void show_mem(void)
+{
+ __show_mem(0);
+}