mm, page_alloc: warn_alloc print nodemask

warn_alloc is currently used for to report an allocation failure or an
allocation stall.  We print some details of the allocation request like
the gfp mask and the request order.  We do not print the allocation
nodemask which is important when debugging the reason for the allocation
failure as well.  We alreaddy print the nodemask in the OOM report.

Add nodemask to warn_alloc and print it in warn_alloc as well.

Link: http://lkml.kernel.org/r/20170117091543.25850-3-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index cf6b53dc08f9..96c8fe602dfb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3028,12 +3028,13 @@ static void warn_alloc_show_mem(gfp_t gfp_mask)
         show_mem(filter);
 }
 
-void warn_alloc(gfp_t gfp_mask, const char *fmt, ...)
+void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...)
 {
         struct va_format vaf;
         va_list args;
         static DEFINE_RATELIMIT_STATE(nopage_rs, DEFAULT_RATELIMIT_INTERVAL,
                                       DEFAULT_RATELIMIT_BURST);
+        nodemask_t *nm = (nodemask) ? nodemask : &cpuset_current_mems_allowed;
 
         if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs) ||
             debug_guardpage_minorder() > 0)
@@ -3047,7 +3048,8 @@ void warn_alloc(gfp_t gfp_mask, const char *fmt, ...)
         pr_cont("%pV", &vaf);
         va_end(args);
 
-        pr_cont(", mode:%#x(%pGg)\n", gfp_mask, &gfp_mask);
+        pr_cont(", mode:%#x(%pGg), nodemask=%*pbl\n", gfp_mask, &gfp_mask, nodemask_pr_args(nm));
+        cpuset_print_current_mems_allowed();
 
         dump_stack();
         warn_alloc_show_mem(gfp_mask);
@@ -3724,7 +3726,7 @@ retry:
 
         /* Make sure we know about allocations which stall for too long */
         if (time_after(jiffies, alloc_start + stall_timeout)) {
-                warn_alloc(gfp_mask,
+                warn_alloc(gfp_mask, ac->nodemask,
                         "page allocation stalls for %ums, order:%u",
                         jiffies_to_msecs(jiffies-alloc_start), order);
                 stall_timeout += 10 * HZ;
@@ -3775,7 +3777,7 @@ nopage:
         if (read_mems_allowed_retry(cpuset_mems_cookie))
                 goto retry_cpuset;
 
-        warn_alloc(gfp_mask,
+        warn_alloc(gfp_mask, ac->nodemask,
                         "page allocation failure: order:%u", order);
 got_pg:
         return page;