Merge branch 'for-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu

Pull percpu updates from Dennis Zhou:

 - scan hint update which helps address performance issues with heavily
   fragmented blocks

 - lockdep fix when freeing an allocation causes balance work to be
   scheduled

* 'for-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu:
  percpu: remove spurious lock dependency between percpu and sched
  percpu: use chunk scan_hint to skip some scanning
  percpu: convert chunk hints to be based on pcpu_block_md
  percpu: make pcpu_block_md generic
  percpu: use block scan_hint to only scan forward
  percpu: remember largest area skipped during allocation
  percpu: add block level scan_hint
  percpu: set PCPU_BITMAP_BLOCK_SIZE to PAGE_SIZE
  percpu: relegate chunks unusable when failing small allocations
  percpu: manage chunks based on contig_bits instead of free_bytes
  percpu: introduce helper to determine if two regions overlap
  percpu: do not search past bitmap when allocating an area
  percpu: update free path with correct new free region

1 files changed, 3 insertions, 9 deletions

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 70b7123f38c7..9909dc0e273a 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -26,16 +26,10 @@
 #define PCPU_MIN_ALLOC_SHIFT            2
 #define PCPU_MIN_ALLOC_SIZE             (1 << PCPU_MIN_ALLOC_SHIFT)
 
-/* number of bits per page, used to trigger a scan if blocks are > PAGE_SIZE */
-#define PCPU_BITS_PER_PAGE              (PAGE_SIZE >> PCPU_MIN_ALLOC_SHIFT)
-
 /*
- * This determines the size of each metadata block.  There are several subtle
- * constraints around this constant.  The reserved region must be a multiple of
- * PCPU_BITMAP_BLOCK_SIZE.  Additionally, PCPU_BITMAP_BLOCK_SIZE must be a
- * multiple of PAGE_SIZE or PAGE_SIZE must be a multiple of
- * PCPU_BITMAP_BLOCK_SIZE to align with the populated page map. The unit_size
- * also has to be a multiple of PCPU_BITMAP_BLOCK_SIZE to ensure full blocks.
+ * The PCPU_BITMAP_BLOCK_SIZE must be the same size as PAGE_SIZE as the
+ * updating of hints is used to manage the nr_empty_pop_pages in both
+ * the chunk and globally.
  */
 #define PCPU_BITMAP_BLOCK_SIZE          PAGE_SIZE
 #define PCPU_BITMAP_BLOCK_BITS          (PCPU_BITMAP_BLOCK_SIZE >>      \