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authorMinchan Kim <minchan@kernel.org>2021-05-05 04:36:57 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-05-05 21:27:24 +0300
commit361a2a229fa31ab7f2b236b5946e434964d00762 (patch)
tree74246feb78afbe5ab7c443d3578d12a784759ff4
parentd479960e44f27e0e52ba31b21740b703c538027c (diff)
downloadlinux-361a2a229fa31ab7f2b236b5946e434964d00762.tar.xz
mm: replace migrate_[prep|finish] with lru_cache_[disable|enable]
Currently, migrate_[prep|finish] is merely a wrapper of lru_cache_[disable|enable]. There is not much to gain from having additional abstraction. Use lru_cache_[disable|enable] instead of migrate_[prep|finish], which would be more descriptive. note: migrate_prep_local in compaction.c changed into lru_add_drain to avoid CPU schedule cost with involving many other CPUs to keep old behavior. Link: https://lkml.kernel.org/r/20210319175127.886124-2-minchan@kernel.org Signed-off-by: Minchan Kim <minchan@kernel.org> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: David Hildenbrand <david@redhat.com> Cc: Chris Goldsworthy <cgoldswo@codeaurora.org> Cc: John Dias <joaodias@google.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Oliver Sang <oliver.sang@intel.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/migrate.h7
-rw-r--r--mm/compaction.c3
-rw-r--r--mm/mempolicy.c8
-rw-r--r--mm/migrate.c28
-rw-r--r--mm/page_alloc.c4
5 files changed, 10 insertions, 40 deletions
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 9e4a2dc8622c..6155d97ec76c 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -45,9 +45,6 @@ extern struct page *alloc_migration_target(struct page *page, unsigned long priv
extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
extern void putback_movable_page(struct page *page);
-extern void migrate_prep(void);
-extern void migrate_finish(void);
-extern void migrate_prep_local(void);
extern void migrate_page_states(struct page *newpage, struct page *page);
extern void migrate_page_copy(struct page *newpage, struct page *page);
extern int migrate_huge_page_move_mapping(struct address_space *mapping,
@@ -67,10 +64,6 @@ static inline struct page *alloc_migration_target(struct page *page,
static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
{ return -EBUSY; }
-static inline int migrate_prep(void) { return -ENOSYS; }
-static inline int migrate_finish(void) { return -ENOSYS; }
-static inline int migrate_prep_local(void) { return -ENOSYS; }
-
static inline void migrate_page_states(struct page *newpage, struct page *page)
{
}
diff --git a/mm/compaction.c b/mm/compaction.c
index 1be7928af62b..598dffbd5c8e 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -2354,7 +2354,8 @@ compact_zone(struct compact_control *cc, struct capture_control *capc)
trace_mm_compaction_begin(start_pfn, cc->migrate_pfn,
cc->free_pfn, end_pfn, sync);
- migrate_prep_local();
+ /* lru_add_drain_all could be expensive with involving other CPUs */
+ lru_add_drain();
while ((ret = compact_finished(cc)) == COMPACT_CONTINUE) {
int err;
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 3b95e169e97d..c0343c742bed 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1124,7 +1124,7 @@ int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
int err = 0;
nodemask_t tmp;
- migrate_prep();
+ lru_cache_disable();
mmap_read_lock(mm);
@@ -1209,7 +1209,7 @@ int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
}
mmap_read_unlock(mm);
- migrate_finish();
+ lru_cache_enable();
if (err < 0)
return err;
return busy;
@@ -1325,7 +1325,7 @@ static long do_mbind(unsigned long start, unsigned long len,
if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) {
- migrate_prep();
+ lru_cache_disable();
}
{
NODEMASK_SCRATCH(scratch);
@@ -1374,7 +1374,7 @@ up_out:
mpol_out:
mpol_put(new);
if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
- migrate_finish();
+ lru_cache_enable();
return err;
}
diff --git a/mm/migrate.c b/mm/migrate.c
index 5b09567dc293..b5fbeb4bf49a 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -57,30 +57,6 @@
#include "internal.h"
-/*
- * migrate_prep() needs to be called before we start compiling a list of pages
- * to be migrated using isolate_lru_page(). If scheduling work on other CPUs is
- * undesirable, use migrate_prep_local()
- */
-void migrate_prep(void)
-{
- /*
- * Clear the LRU lists so pages can be isolated.
- */
- lru_cache_disable();
-}
-
-void migrate_finish(void)
-{
- lru_cache_enable();
-}
-
-/* Do the necessary work of migrate_prep but not if it involves other CPUs */
-void migrate_prep_local(void)
-{
- lru_add_drain();
-}
-
int isolate_movable_page(struct page *page, isolate_mode_t mode)
{
struct address_space *mapping;
@@ -1771,7 +1747,7 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
int start, i;
int err = 0, err1;
- migrate_prep();
+ lru_cache_disable();
for (i = start = 0; i < nr_pages; i++) {
const void __user *p;
@@ -1840,7 +1816,7 @@ out_flush:
if (err >= 0)
err = err1;
out:
- migrate_finish();
+ lru_cache_enable();
return err;
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2cefb634e0d6..80754fc1f1ff 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8681,7 +8681,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
.gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL,
};
- migrate_prep();
+ lru_cache_disable();
while (pfn < end || !list_empty(&cc->migratepages)) {
if (fatal_signal_pending(current)) {
@@ -8716,7 +8716,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
break;
}
- migrate_finish();
+ lru_cache_enable();
if (ret < 0) {
alloc_contig_dump_pages(&cc->migratepages);
putback_movable_pages(&cc->migratepages);