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Subject[RFC] mm/migrate: Add new migration reason MR_HUGETLB
Date
alloc_contig_range() initiates compaction and eventual migration for
the purpose of either CMA or HugeTLB allocation. At present, reason
code remains the same MR_CMA for either of those cases. Lets add a
new reason code which will differentiate the purpose of migration
as HugeTLB allocation instead.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
include/linux/migrate.h | 1 +
include/trace/events/migrate.h | 3 ++-
mm/page_alloc.c | 14 ++++++++++----
3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index a732598fcf83..44381c33a2bd 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -26,6 +26,7 @@ enum migrate_reason {
MR_MEMPOLICY_MBIND,
MR_NUMA_MISPLACED,
MR_CMA,
+ MR_HUGETLB,
MR_TYPES
};

diff --git a/include/trace/events/migrate.h b/include/trace/events/migrate.h
index bcf4daccd6be..61474c93f8f3 100644
--- a/include/trace/events/migrate.h
+++ b/include/trace/events/migrate.h
@@ -20,7 +20,8 @@
EM( MR_SYSCALL, "syscall_or_cpuset") \
EM( MR_MEMPOLICY_MBIND, "mempolicy_mbind") \
EM( MR_NUMA_MISPLACED, "numa_misplaced") \
- EMe(MR_CMA, "cma")
+ EM( MR_CMA, "cma") \
+ EMe(MR_HUGETLB, "hugetlb")

/*
* First define the enums in the above macros to be exported to userspace
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 242565855d05..ce8a2f2d4994 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7588,13 +7588,14 @@ static unsigned long pfn_max_align_up(unsigned long pfn)

/* [start, end) must belong to a single zone. */
static int __alloc_contig_migrate_range(struct compact_control *cc,
- unsigned long start, unsigned long end)
+ unsigned long start, unsigned long end,
+ unsigned migratetype)
{
/* This function is based on compact_zone() from compaction.c. */
unsigned long nr_reclaimed;
unsigned long pfn = start;
unsigned int tries = 0;
- int ret = 0;
+ int ret = 0, migrate_reason = 0;

migrate_prep();

@@ -7621,8 +7622,13 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
&cc->migratepages);
cc->nr_migratepages -= nr_reclaimed;

+ if (migratetype == MIGRATE_CMA)
+ migrate_reason = MR_CMA;
+ else
+ migrate_reason = MR_HUGETLB;
+
ret = migrate_pages(&cc->migratepages, new_page_alloc_contig,
- NULL, 0, cc->mode, MR_CMA);
+ NULL, 0, cc->mode, migrate_reason);
}
if (ret < 0) {
putback_movable_pages(&cc->migratepages);
@@ -7710,7 +7716,7 @@ int alloc_contig_range(unsigned long start, unsigned long end,
* allocated. So, if we fall through be sure to clear ret so that
* -EBUSY is not accidentally used or returned to caller.
*/
- ret = __alloc_contig_migrate_range(&cc, start, end);
+ ret = __alloc_contig_migrate_range(&cc, start, end, migratetype);
if (ret && ret != -EBUSY)
goto done;
ret =0;
--
2.11.0
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