diff options
| author | David Rientjes <rientjes@google.com> | 2013-04-29 15:06:11 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-13 15:42:49 -0700 |
| commit | 022a41db8aa1bc0b4ff4c013f889292324a1c465 (patch) | |
| tree | 11f00ef8d0aa584b956a194de5ee4c3be5fc5120 /arch/arm | |
| parent | 9712612a91e92824349ce9fece31dba6d2fbde70 (diff) | |
mm, show_mem: suppress page counts in non-blockable contexts
commit 4b59e6c4730978679b414a8da61514a2518da512 upstream.
On large systems with a lot of memory, walking all RAM to determine page
types may take a half second or even more.
In non-blockable contexts, the page allocator will emit a page allocation
failure warning unless __GFP_NOWARN is specified. In such contexts, irqs
are typically disabled and such a lengthy delay may even result in NMI
watchdog timeouts.
To fix this, suppress the page walk in such contexts when printing the
page allocation failure warning.
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Xishi Qiu <qiuxishi@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mm/init.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c index 8f5813bbffb5..056cfbed307d 100644 --- a/arch/arm/mm/init.c +++ b/arch/arm/mm/init.c @@ -98,6 +98,9 @@ void show_mem(unsigned int filter) printk("Mem-info:\n"); show_free_areas(filter); + if (filter & SHOW_MEM_FILTER_PAGE_COUNT) + return; + for_each_bank (i, mi) { struct membank *bank = &mi->bank[i]; unsigned int pfn1, pfn2; |