tree: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: a0d4287f787889e59db0fd295853a0f1f55d0699
commit: c1c531ec36aa1901a831d111eb4ec5c16bf68c30 [3506/3880] mm/compaction: more trace to understand when/why compaction start/finish
reproduce:
# apt-get install sparse
git checkout c1c531ec36aa1901a831d111eb4ec5c16bf68c30
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__
sparse warnings: (new ones prefixed by >>)
>> include/trace/events/compaction.h:167:1: sparse: cast to restricted gfp_t
>> include/trace/events/compaction.h:167:1: sparse: cast to restricted gfp_t
>> include/trace/events/compaction.h:167:1: sparse: restricted gfp_t degrades to integer
>> include/trace/events/compaction.h:167:1: sparse: restricted gfp_t degrades to integer
mm/compaction.c:1393:37: sparse: incorrect type in initializer (different base types)
mm/compaction.c:1393:37: expected int [signed] may_enter_fs
mm/compaction.c:1393:37: got restricted gfp_t
mm/compaction.c:1394:39: sparse: incorrect type in initializer (different base types)
mm/compaction.c:1394:39: expected int [signed] may_perform_io
mm/compaction.c:1394:39: got restricted gfp_t
include/trace/events/compaction.h:103:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
include/trace/events/compaction.h:133:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
mm/compaction.c:242:13: sparse: context imbalance in 'compact_trylock_irqsave' - wrong count at exit
include/linux/spinlock.h:364:9: sparse: context imbalance in 'compact_unlock_should_abort' - unexpected unlock
mm/compaction.c:449:39: sparse: context imbalance in 'isolate_freepages_block' - unexpected unlock
mm/compaction.c:747:39: sparse: context imbalance in 'isolate_migratepages_block' - unexpected unlock
vim +167 include/trace/events/compaction.h
151 __entry->migrate_pfn = migrate_pfn;
152 __entry->free_pfn = free_pfn;
153 __entry->zone_end = zone_end;
154 __entry->sync = sync;
155 __entry->status = status;
156 ),
157
158 TP_printk("zone_start=0x%lx migrate_pfn=0x%lx free_pfn=0x%lx zone_end=0x%lx, mode=%s status=%s",
159 __entry->zone_start,
160 __entry->migrate_pfn,
161 __entry->free_pfn,
162 __entry->zone_end,
163 __entry->sync ? "sync" : "async",
164 compaction_status_string[__entry->status])
165 );
166
> 167 TRACE_EVENT(mm_compaction_try_to_compact_pages,
168
169 TP_PROTO(
170 int order,
171 gfp_t gfp_mask,
172 enum migrate_mode mode),
173
174 TP_ARGS(order, gfp_mask, mode),
175
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