path: root/mm/percpu-km.c
diff options
authorTejun Heo <>2014-09-02 14:46:02 -0400
committerTejun Heo <>2014-09-02 14:46:02 -0400
commita93ace487a339dccf7040be7fee08c3415188e14 (patch)
treee16b34a84906894031975080bcc55040d02cfdf7 /mm/percpu-km.c
parentdca496451bddea9aa87b7510dc2eb413d1a19dfd (diff)
percpu: move region iterations out of pcpu_[de]populate_chunk()
Previously, pcpu_[de]populate_chunk() were called with the range which may contain multiple target regions in it and pcpu_[de]populate_chunk() iterated over the regions. This has the benefit of batching up cache flushes for all the regions; however, we're planning to add more bookkeeping logic around [de]population to support atomic allocations and this delegation of iterations gets in the way. This patch moves the region iterations out of pcpu_[de]populate_chunk() into its callers - pcpu_alloc() and pcpu_reclaim() - so that we can later add logic to track more states around them. This change may make cache and tlb flushes more frequent but multi-region [de]populations are rare anyway and if this actually becomes a problem, it's not difficult to factor out cache flushes as separate callbacks which are directly invoked from percpu.c. Signed-off-by: Tejun Heo <>
Diffstat (limited to 'mm/percpu-km.c')
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/percpu-km.c b/mm/percpu-km.c
index 9a9096f08867..a6e34bc1aff4 100644
--- a/mm/percpu-km.c
+++ b/mm/percpu-km.c
@@ -33,12 +33,14 @@
#include <linux/log2.h>
-static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size)
+static int pcpu_populate_chunk(struct pcpu_chunk *chunk,
+ int page_start, int page_end)
return 0;
-static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size)
+static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk,
+ int page_start, int page_end)
/* nada */