From: Michal Hocko <mhocko@xxxxxxxx>
Subject: mm: consider memblock reservations for deferred memory initialization sizing
We have seen an early OOM killer invocation on ppc64 systems with
crashkernel=4096M
kthreadd invoked oom-killer: gfp_mask=0x16040c0(GFP_KERNEL|__GFP_COMP|__GFP_NOTRACK), nodemask=7, order=0, oom_score_adj=0
kthreadd cpuset=/ mems_allowed=7
CPU: 0 PID: 2 Comm: kthreadd Not tainted 4.4.68-1.gd7fe927-default #1
Call Trace:
[c0000000072fb7c0] [c00000000080830c] dump_stack+0xb0/0xf0 (unreliable)
[c0000000072fb800] [c0000000008032d4] dump_header+0xb0/0x258
[c0000000072fb8e0] [c00000000023dfc0] out_of_memory+0x5f0/0x640
[c0000000072fb990] [c00000000024459c] __alloc_pages_nodemask+0xa8c/0xc80
[c0000000072fbb10] [c0000000002b2504] kmem_getpages+0x84/0x1a0
[c0000000072fbb50] [c0000000002b5174] fallback_alloc+0x2a4/0x320
[c0000000072fbbc0] [c0000000002b4240] kmem_cache_alloc_node+0xc0/0x2e0
[c0000000072fbc30] [c0000000000b9a80] copy_process.isra.25+0x260/0x1b30
[c0000000072fbd10] [c0000000000bb514] _do_fork+0x94/0x470
[c0000000072fbd80] [c0000000000bb978] kernel_thread+0x48/0x60
[c0000000072fbda0] [c0000000000e9df4] kthreadd+0x264/0x330
[c0000000072fbe30] [c000000000009538] ret_from_kernel_thread+0x5c/0xa4
Mem-Info:
active_anon:0 inactive_anon:0 isolated_anon:0
active_file:0 inactive_file:0 isolated_file:0
unevictable:0 dirty:0 writeback:0 unstable:0
slab_reclaimable:5 slab_unreclaimable:73
mapped:0 shmem:0 pagetables:0 bounce:0
free:0 free_pcp:0 free_cma:0
Node 7 DMA free:0kB min:0kB low:0kB high:0kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:52428800kB managed:110016kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:320kB slab_unreclaimable:4672kB kernel_stack:1152kB pagetables:0kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
lowmem_reserve[]: 0 0 0 0
Node 7 DMA: 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 0*8192kB 0*16384kB = 0kB
0 total pagecache pages
0 pages in swap cache
Swap cache stats: add 0, delete 0, find 0/0
Free swap = 0kB
Total swap = 0kB
819200 pages RAM
0 pages HighMem/MovableOnly
817481 pages reserved
0 pages cma reserved
0 pages hwpoisoned
the reason is that the managed memory is too low (only 110MB) while the
rest of the the 50GB is still waiting for the deferred intialization to be
done. update_defer_init estimates the initial memoty to initialize to 2GB
at least but it doesn't consider any memory allocated in that range. In
this particular case we've had
Reserving 4096MB of memory at 128MB for crashkernel (System RAM: 51200MB)
so the low 2GB is mostly depleted.
Fix this by considering memblock allocations in the initial static
initialization estimation. Move the max_initialise to
reset_deferred_meminit and implement a simple memblock_reserved_memory
helper which iterates all reserved blocks and sums the size of all that
start below the given address. The cumulative size is than added on top
of the initial estimation. This is still not ideal because
reset_deferred_meminit doesn't consider holes and so reservation might be
above the initial estimation whihch we ignore but let's make the logic
simpler until we really need to handle more complicated cases.
Fixes: 3a80a7fa7989 ("mm: meminit: initialise a subset of struct pages if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set")
Link: http://lkml.kernel.org/r/20170531104010.GI27783@xxxxxxxxxxxxxx
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Mel Gorman <mgorman@xxxxxxx>
Tested-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [4.2+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/memblock.h | 8 ++++++++
include/linux/mmzone.h | 1 +
mm/memblock.c | 23 +++++++++++++++++++++++
mm/page_alloc.c | 33 ++++++++++++++++++++++-----------
4 files changed, 54 insertions(+), 11 deletions(-)
diff -puN include/linux/memblock.h~mm-consider-memblock-reservations-for-deferred-memory-initialization-sizing include/linux/memblock.h
--- a/include/linux/memblock.h~mm-consider-memblock-reservations-for-deferred-memory-initialization-sizing
+++ a/include/linux/memblock.h
@@ -425,11 +425,19 @@ static inline void early_memtest(phys_ad
}
#endif
+extern unsigned long memblock_reserved_memory_within(phys_addr_t start_addr,
+ phys_addr_t end_addr);
#else
static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
{
return 0;
}
+
+static inline unsigned long memblock_reserved_memory_within(phys_addr_t start_addr,
+ phys_addr_t end_addr)
+{
+ return 0;
+}
#endif /* CONFIG_HAVE_MEMBLOCK */
diff -puN include/linux/mmzone.h~mm-consider-memblock-reservations-for-deferred-memory-initialization-sizing include/linux/mmzone.h
--- a/include/linux/mmzone.h~mm-consider-memblock-reservations-for-deferred-memory-initialization-sizing
+++ a/include/linux/mmzone.h
@@ -678,6 +678,7 @@ typedef struct pglist_data {
* is the first PFN that needs to be initialised.
*/
unsigned long first_deferred_pfn;
+ unsigned long static_init_size;
#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
diff -puN mm/memblock.c~mm-consider-memblock-reservations-for-deferred-memory-initialization-sizing mm/memblock.c
--- a/mm/memblock.c~mm-consider-memblock-reservations-for-deferred-memory-initialization-sizing
+++ a/mm/memblock.c
@@ -1739,6 +1739,29 @@ static void __init_memblock memblock_dum
}
}
+extern unsigned long __init_memblock
+memblock_reserved_memory_within(phys_addr_t start_addr, phys_addr_t end_addr)
+{
+ struct memblock_region *rgn;
+ unsigned long size = 0;
+ int idx;
+
+ for_each_memblock_type((&memblock.reserved), rgn) {
+ phys_addr_t start, end;
+
+ if (rgn->base + rgn->size < start_addr)
+ continue;
+ if (rgn->base > end_addr)
+ continue;
+
+ start = rgn->base;
+ end = start + rgn->size;
+ size += end - start;
+ }
+
+ return size;
+}
+
void __init_memblock __memblock_dump_all(void)
{
pr_info("MEMBLOCK configuration:\n");
diff -puN mm/page_alloc.c~mm-consider-memblock-reservations-for-deferred-memory-initialization-sizing mm/page_alloc.c
--- a/mm/page_alloc.c~mm-consider-memblock-reservations-for-deferred-memory-initialization-sizing
+++ a/mm/page_alloc.c
@@ -292,6 +292,26 @@ int page_group_by_mobility_disabled __re
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
static inline void reset_deferred_meminit(pg_data_t *pgdat)
{
+ unsigned long max_initialise;
+ unsigned long reserved_lowmem;
+
+ /*
+ * Initialise at least 2G of a node but also take into account that
+ * two large system hashes that can take up 1GB for 0.25TB/node.
+ */
+ max_initialise = max(2UL << (30 - PAGE_SHIFT),
+ (pgdat->node_spanned_pages >> 8));
+
+ /*
+ * Compensate the all the memblock reservations (e.g. crash kernel)
+ * from the initial estimation to make sure we will initialize enough
+ * memory to boot.
+ */
+ reserved_lowmem = memblock_reserved_memory_within(pgdat->node_start_pfn,
+ pgdat->node_start_pfn + max_initialise);
+ max_initialise += reserved_lowmem;
+
+ pgdat->static_init_size = min(max_initialise, pgdat->node_spanned_pages);
pgdat->first_deferred_pfn = ULONG_MAX;
}
@@ -314,20 +334,11 @@ static inline bool update_defer_init(pg_
unsigned long pfn, unsigned long zone_end,
unsigned long *nr_initialised)
{
- unsigned long max_initialise;
-
/* Always populate low zones for address-contrained allocations */
if (zone_end < pgdat_end_pfn(pgdat))
return true;
- /*
- * Initialise at least 2G of a node but also take into account that
- * two large system hashes that can take up 1GB for 0.25TB/node.
- */
- max_initialise = max(2UL << (30 - PAGE_SHIFT),
- (pgdat->node_spanned_pages >> 8));
-
(*nr_initialised)++;
- if ((*nr_initialised > max_initialise) &&
+ if ((*nr_initialised > pgdat->static_init_size) &&
(pfn & (PAGES_PER_SECTION - 1)) == 0) {
pgdat->first_deferred_pfn = pfn;
return false;
@@ -6138,7 +6149,6 @@ void __paginginit free_area_init_node(in
/* pg_data_t should be reset to zero when it's allocated */
WARN_ON(pgdat->nr_zones || pgdat->kswapd_classzone_idx);
- reset_deferred_meminit(pgdat);
pgdat->node_id = nid;
pgdat->node_start_pfn = node_start_pfn;
pgdat->per_cpu_nodestats = NULL;
@@ -6160,6 +6170,7 @@ void __paginginit free_area_init_node(in
(unsigned long)pgdat->node_mem_map);
#endif
+ reset_deferred_meminit(pgdat);
free_area_init_core(pgdat);
}
_