diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-04-26 18:15:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-04-26 18:15:33 -0700 |
| commit | ce944935eef2a56f7efe5c765794e77380651b58 (patch) | |
| tree | 2223065a8f33e7cf5cdf1bac36aa3366e4a34eff /mm/page_alloc.c | |
| parent | 857e17c2ee7c426c1f8998ccd48e2d5a7542148d (diff) | |
| parent | 89189557b47b35683a27c80ee78aef18248eefb4 (diff) | |
Merge branch 'akpm' (patches from Andrew)
Merge misc fixes from Andrew Morton:
"9 fixes"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
fs/proc/proc_sysctl.c: Fix a NULL pointer dereference
mm/page_alloc.c: fix never set ALLOC_NOFRAGMENT flag
mm/page_alloc.c: avoid potential NULL pointer dereference
mm, page_alloc: always use a captured page regardless of compaction result
mm: do not boost watermarks to avoid fragmentation for the DISCONTIG memory model
lib/test_vmalloc.c: do not create cpumask_t variable on stack
lib/Kconfig.debug: fix build error without CONFIG_BLOCK
zram: pass down the bvec we need to read into in the work struct
mm/memory_hotplug.c: drop memory device reference after find_memory_block()
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c6ce20aaf80b..c02cff1ed56e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -266,7 +266,20 @@ compound_page_dtor * const compound_page_dtors[] = { int min_free_kbytes = 1024; int user_min_free_kbytes = -1; +#ifdef CONFIG_DISCONTIGMEM +/* + * DiscontigMem defines memory ranges as separate pg_data_t even if the ranges + * are not on separate NUMA nodes. Functionally this works but with + * watermark_boost_factor, it can reclaim prematurely as the ranges can be + * quite small. By default, do not boost watermarks on discontigmem as in + * many cases very high-order allocations like THP are likely to be + * unsupported and the premature reclaim offsets the advantage of long-term + * fragmentation avoidance. + */ +int watermark_boost_factor __read_mostly; +#else int watermark_boost_factor __read_mostly = 15000; +#endif int watermark_scale_factor = 10; static unsigned long nr_kernel_pages __initdata; @@ -3419,8 +3432,11 @@ alloc_flags_nofragment(struct zone *zone, gfp_t gfp_mask) alloc_flags |= ALLOC_KSWAPD; #ifdef CONFIG_ZONE_DMA32 + if (!zone) + return alloc_flags; + if (zone_idx(zone) != ZONE_NORMAL) - goto out; + return alloc_flags; /* * If ZONE_DMA32 exists, assume it is the one after ZONE_NORMAL and @@ -3429,9 +3445,9 @@ alloc_flags_nofragment(struct zone *zone, gfp_t gfp_mask) */ BUILD_BUG_ON(ZONE_NORMAL - ZONE_DMA32 != 1); if (nr_online_nodes > 1 && !populated_zone(--zone)) - goto out; + return alloc_flags; -out: + alloc_flags |= ALLOC_NOFRAGMENT; #endif /* CONFIG_ZONE_DMA32 */ return alloc_flags; } @@ -3773,11 +3789,6 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, memalloc_noreclaim_restore(noreclaim_flag); psi_memstall_leave(&pflags); - if (*compact_result <= COMPACT_INACTIVE) { - WARN_ON_ONCE(page); - return NULL; - } - /* * At least in one zone compaction wasn't deferred or skipped, so let's * count a compaction stall |