mm: consolidate warn_alloc_failed users

warn_alloc_failed is currently used from the page and vmalloc
allocators.  This is a good reuse of the code except that vmalloc would
appreciate a slightly different warning message.  This is already
handled by the fmt parameter except that

  "%s: page allocation failure: order:%u, mode:%#x(%pGg)"

is printed anyway.  This might be quite misleading because it might be a
vmalloc failure which leads to the warning while the page allocator is
not the culprit here.  Fix this by always using the fmt string and only
print the context that makes sense for the particular context (e.g.
order makes only very little sense for the vmalloc context).

Rename the function to not miss any user and also because a later patch
will reuse it also for !failure cases.

Link: http://lkml.kernel.org/r/20160929084407.7004-2-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 2c8ed8a894c83b73ac34431a7657bc8e15b07039..f7231411ad5a31b17a315dbcb9694eb3ad915b98 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1916,9 +1916,8 @@ extern void si_meminfo_node(struct sysinfo *val, int nid);
 extern unsigned long arch_reserved_kernel_pages(void);
 #endif
 
-extern __printf(3, 4)
-void warn_alloc_failed(gfp_t gfp_mask, unsigned int order,
-               const char *fmt, ...);
+extern __printf(2, 3)
+void warn_alloc(gfp_t gfp_mask, const char *fmt, ...);
 
 extern void setup_per_cpu_pageset(void);
 

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index bcfa647c1752484e83c89219eee7eba82ad97b3b..5ab2e30a100685217ac7b3367c3f0e4acbeb241a 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2979,9 +2979,11 @@ static DEFINE_RATELIMIT_STATE(nopage_rs,
                DEFAULT_RATELIMIT_INTERVAL,
                DEFAULT_RATELIMIT_BURST);
 
-void warn_alloc_failed(gfp_t gfp_mask, unsigned int order, const char *fmt, ...)
+void warn_alloc(gfp_t gfp_mask, const char *fmt, ...)
 {
        unsigned int filter = SHOW_MEM_FILTER_NODES;
+       struct va_format vaf;
+       va_list args;
 
        if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs) ||
            debug_guardpage_minorder() > 0)
@@ -2999,22 +3001,16 @@ void warn_alloc_failed(gfp_t gfp_mask, unsigned int order, const char *fmt, ...)
        if (in_interrupt() || !(gfp_mask & __GFP_DIRECT_RECLAIM))
                filter &= ~SHOW_MEM_FILTER_NODES;
 
-       if (fmt) {
-               struct va_format vaf;
-               va_list args;
+       pr_warn("%s: ", current->comm);
 
-               va_start(args, fmt);
+       va_start(args, fmt);
+       vaf.fmt = fmt;
+       vaf.va = &args;
+       pr_cont("%pV", &vaf);
+       va_end(args);
 
-               vaf.fmt = fmt;
-               vaf.va = &args;
+       pr_cont(", mode:%#x(%pGg)\n", gfp_mask, &gfp_mask);
 
-               pr_warn("%pV", &vaf);
-
-               va_end(args);
-       }
-
-       pr_warn("%s: page allocation failure: order:%u, mode:%#x(%pGg)\n",
-               current->comm, order, gfp_mask, &gfp_mask);
        dump_stack();
        if (!should_suppress_show_mem())
                show_mem(filter);
@@ -3680,7 +3676,8 @@ retry:
        }
 
 nopage:
-       warn_alloc_failed(gfp_mask, order, NULL);
+       warn_alloc(gfp_mask,
+                       "page allocation failure: order:%u", order);
 got_pg:
        return page;
 }

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 80660a0f989b6371dfa08406de6cd11bfd136382..f2481cb4e6b216e40252b0000b5fcea0d3cb9d30 100644 (file)
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1601,7 +1601,6 @@ static void *__vmalloc_node(unsigned long size, unsigned long align,
 static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
                                 pgprot_t prot, int node)
 {
-       const int order = 0;
        struct page **pages;
        unsigned int nr_pages, array_size, i;
        const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
@@ -1629,9 +1628,9 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
                struct page *page;
 
                if (node == NUMA_NO_NODE)
-                       page = alloc_pages(alloc_mask, order);
+                       page = alloc_page(alloc_mask);
                else
-                       page = alloc_pages_node(node, alloc_mask, order);
+                       page = alloc_pages_node(node, alloc_mask, 0);
 
                if (unlikely(!page)) {
                        /* Successfully allocated i pages, free them in __vunmap() */
@@ -1648,8 +1647,8 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
        return area->addr;
 
 fail:
-       warn_alloc_failed(gfp_mask, order,
-                         "vmalloc: allocation failure, allocated %ld of %ld bytes\n",
+       warn_alloc(gfp_mask,
+                         "vmalloc: allocation failure, allocated %ld of %ld bytes",
                          (area->nr_pages*PAGE_SIZE), area->size);
        vfree(area->addr);
        return NULL;
@@ -1710,9 +1709,8 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
        return addr;
 
 fail:
-       warn_alloc_failed(gfp_mask, 0,
-                         "vmalloc: allocation failure: %lu bytes\n",
-                         real_size);
+       warn_alloc(gfp_mask,
+                         "vmalloc: allocation failure: %lu bytes", real_size);
        return NULL;
 }