diff options
author | David Rientjes <rientjes@google.com> | 2013-04-18 09:47:01 +1000 |
---|---|---|
committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2013-04-23 17:17:54 +1000 |
commit | 71233250200f43408f94714f2150f4744da586e1 (patch) | |
tree | ceb032bc80fbf9bd3a9ba9119bf8a95630c7208c /mm | |
parent | ad092a722139f8144c2d11c753197caf88729edd (diff) |
mm, hugetlb: include hugepages in meminfo
Particularly in oom conditions, it's troublesome that hugetlb memory is
not displayed. All other meminfo that is emitted will not add up to what
is expected, and there is no artifact left in the kernel log to show that
a potentially significant amount of memory is actually allocated as
hugepages which are not available to be reclaimed.
Booting with hugepages=8192 on the command line, this memory is now shown
in oom conditions. For example, with echo m > /proc/sysrq-trigger:
Node 0 hugepages_total=2048 hugepages_free=2048 hugepages_surp=0 hugepages_size=2048kB
Node 1 hugepages_total=2048 hugepages_free=2048 hugepages_surp=0 hugepages_size=2048kB
Node 2 hugepages_total=2048 hugepages_free=2048 hugepages_surp=0 hugepages_size=2048kB
Node 3 hugepages_total=2048 hugepages_free=2048 hugepages_surp=0 hugepages_size=2048kB
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/hugetlb.c | 15 | ||||
-rw-r--r-- | mm/page_alloc.c | 3 |
2 files changed, 18 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index bdb4d4d75f4c..799f17661cc0 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2121,6 +2121,21 @@ int hugetlb_report_node_meminfo(int nid, char *buf) nid, h->surplus_huge_pages_node[nid]); } +void hugetlb_show_meminfo(void) +{ + struct hstate *h; + int nid; + + for_each_node_state(nid, N_MEMORY) + for_each_hstate(h) + pr_info("Node %d hugepages_total=%u hugepages_free=%u hugepages_surp=%u hugepages_size=%lukB\n", + nid, + h->nr_huge_pages_node[nid], + h->free_huge_pages_node[nid], + h->surplus_huge_pages_node[nid], + 1UL << (huge_page_order(h) + PAGE_SHIFT - 10)); +} + /* Return the number pages of memory we physically have, in PAGE_SIZE units. */ unsigned long hugetlb_total_pages(void) { diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 72da11c6804d..7350986bbf99 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -58,6 +58,7 @@ #include <linux/prefetch.h> #include <linux/migrate.h> #include <linux/page-debug-flags.h> +#include <linux/hugetlb.h> #include <linux/sched/rt.h> #include <asm/tlbflush.h> @@ -3113,6 +3114,8 @@ void show_free_areas(unsigned int filter) printk("= %lukB\n", K(total)); } + hugetlb_show_meminfo(); + printk("%ld total pagecache pages\n", global_page_state(NR_FILE_PAGES)); show_swap_cache_info(); |