mm, show_mem: suppress page counts in non-blockable contexts

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>

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index ad722f1..ad9a9f3 100644 (file)
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -99,6 +99,9 @@ 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;

diff --git a/arch/ia64/mm/contig.c b/arch/ia64/mm/contig.c
index 80dab50..67c59eb 100644 (file)
--- a/arch/ia64/mm/contig.c
+++ b/arch/ia64/mm/contig.c
@@ -47,6 +47,8 @@ void show_mem(unsigned int filter)
        printk(KERN_INFO "Mem-info:\n");
        show_free_areas(filter);
        printk(KERN_INFO "Node memory in pages:\n");
+       if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
+               return;
        for_each_online_pgdat(pgdat) {
                unsigned long present;
                unsigned long flags;

diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
index c2e955e..a57436e 100644 (file)
--- a/arch/ia64/mm/discontig.c
+++ b/arch/ia64/mm/discontig.c
@@ -623,6 +623,8 @@ void show_mem(unsigned int filter)
 
        printk(KERN_INFO "Mem-info:\n");
        show_free_areas(filter);
+       if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
+               return;
        printk(KERN_INFO "Node memory in pages:\n");
        for_each_online_pgdat(pgdat) {
                unsigned long present;

diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index 3ac462d..cf2da13 100644 (file)
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -697,6 +697,8 @@ void show_mem(unsigned int filter)
 
        printk(KERN_INFO "Mem-info:\n");
        show_free_areas(filter);
+       if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
+               return;
 #ifndef CONFIG_DISCONTIGMEM
        i = max_mapnr;
        while (i-- > 0) {

diff --git a/arch/unicore32/mm/init.c b/arch/unicore32/mm/init.c
index de186bd..6444828 100644 (file)
--- a/arch/unicore32/mm/init.c
+++ b/arch/unicore32/mm/init.c
@@ -66,6 +66,9 @@ void show_mem(unsigned int filter)
        printk(KERN_DEFAULT "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;

diff --git a/include/linux/mm.h b/include/linux/mm.h
index e2091b8..f3c7b1f 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -899,7 +899,8 @@ extern void pagefault_out_of_memory(void);
  * Flags passed to show_mem() and show_free_areas() to suppress output in
  * various contexts.
  */
-#define SHOW_MEM_FILTER_NODES  (0x0001u)       /* filter disallowed nodes */
+#define SHOW_MEM_FILTER_NODES          (0x0001u)       /* disallowed nodes */
+#define SHOW_MEM_FILTER_PAGE_COUNT     (0x0002u)       /* page type count */
 
 extern void show_free_areas(unsigned int flags);
 extern bool skip_free_areas_node(unsigned int flags, int nid);

diff --git a/lib/show_mem.c b/lib/show_mem.c
index 4407f8c..b7c7231 100644 (file)
--- a/lib/show_mem.c
+++ b/lib/show_mem.c
@@ -18,6 +18,9 @@ void show_mem(unsigned int filter)
        printk("Mem-Info:\n");
        show_free_areas(filter);
 
+       if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
+               return;
+
        for_each_online_pgdat(pgdat) {
                unsigned long i, flags;
 

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7ff1536..da7a2fe 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2003,6 +2003,13 @@ void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...)
                return;
 
        /*
+        * Walking all memory to count page types is very expensive and should
+        * be inhibited in non-blockable contexts.
+        */
+       if (!(gfp_mask & __GFP_WAIT))
+               filter |= SHOW_MEM_FILTER_PAGE_COUNT;
+
+       /*
         * This documents exceptions given to allocations in certain
         * contexts that are allowed to allocate outside current's set
         * of allowed nodes.