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authorMichal Hocko <mhocko@suse.com>2017-11-15 17:38:56 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-15 18:21:07 -0800
commitfcdaf842bd8f538a88059ce0243bc2822ed1b0e0 (patch)
treee8f1739778b4f0e8d11b630482b55f197694c842 /mm
parentfec11bc0396bbd82b152e6ce9a47483ffd69462a (diff)
download96b-common-fcdaf842bd8f538a88059ce0243bc2822ed1b0e0.tar.gz
mm, sparse: do not swamp log with huge vmemmap allocation failures
While doing memory hotplug tests under heavy memory pressure we have noticed too many page allocation failures when allocating vmemmap memmap backed by huge page kworker/u3072:1: page allocation failure: order:9, mode:0x24084c0(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO) [...] Call Trace: dump_trace+0x59/0x310 show_stack_log_lvl+0xea/0x170 show_stack+0x21/0x40 dump_stack+0x5c/0x7c warn_alloc_failed+0xe2/0x150 __alloc_pages_nodemask+0x3ed/0xb20 alloc_pages_current+0x7f/0x100 vmemmap_alloc_block+0x79/0xb6 __vmemmap_alloc_block_buf+0x136/0x145 vmemmap_populate+0xd2/0x2b9 sparse_mem_map_populate+0x23/0x30 sparse_add_one_section+0x68/0x18e __add_pages+0x10a/0x1d0 arch_add_memory+0x4a/0xc0 add_memory_resource+0x89/0x160 add_memory+0x6d/0xd0 acpi_memory_device_add+0x181/0x251 acpi_bus_attach+0xfd/0x19b acpi_bus_scan+0x59/0x69 acpi_device_hotplug+0xd2/0x41f acpi_hotplug_work_fn+0x1a/0x23 process_one_work+0x14e/0x410 worker_thread+0x116/0x490 kthread+0xbd/0xe0 ret_from_fork+0x3f/0x70 and we do see many of those because essentially every allocation fails for each memory section. This is an excessive way to tell the user that there is nothing to really worry about because we do have a fallback mechanism to use base pages. The only downside might be a performance degradation due to TLB pressure. This patch changes vmemmap_alloc_block() to use __GFP_NOWARN and warn explicitly once on the first allocation failure. This will reduce the noise in the kernel log considerably, while we still have an indication that a performance might be impacted. [mhocko@kernel.org: forgot to git add the follow up fix] Link: http://lkml.kernel.org/r/20171107090635.c27thtse2lchjgvb@dhcp22.suse.cz Link: http://lkml.kernel.org/r/20171106092228.31098-1-mhocko@kernel.org Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Michal Hocko <mhocko@suse.com> Cc: Joe Perches <joe@perches.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Khalid Aziz <khalid.aziz@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/sparse-vmemmap.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index 4e49762599c8..17acf01791fa 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -53,12 +53,20 @@ void * __meminit vmemmap_alloc_block(unsigned long size, int node)
{
/* If the main allocator is up use that, fallback to bootmem. */
if (slab_is_available()) {
+ gfp_t gfp_mask = GFP_KERNEL|__GFP_RETRY_MAYFAIL|__GFP_NOWARN;
+ int order = get_order(size);
+ static bool warned;
struct page *page;
- page = alloc_pages_node(node, GFP_KERNEL | __GFP_RETRY_MAYFAIL,
- get_order(size));
+ page = alloc_pages_node(node, gfp_mask, order);
if (page)
return page_address(page);
+
+ if (!warned) {
+ warn_alloc(gfp_mask & ~__GFP_NOWARN, NULL,
+ "vmemmap alloc failure: order:%u", order);
+ warned = true;
+ }
return NULL;
} else
return __earlyonly_bootmem_alloc(node, size, size,