On page allocations, SLAB and SLUB modify zone page state counters
NR_SLAB_UNRECLAIMABLE or NR_SLAB_RECLAIMABLE.
This allows to obtain slab usage information at /proc/meminfo.
Without this patch, /proc/meminfo will show zero Slab usage for SLOB.
Since SLOB discards SLAB_RECLAIM_ACCOUNT flag, we always use
NR_SLAB_UNRECLAIMABLE zone state item.
Cc: Christoph Lameter <c...@linux-foundation.org>
Cc: Pekka Enberg <penb...@kernel.org>
Cc: Matt Mackall <m...@selenic.com>
Signed-off-by: Ezequiel Garcia <elezegar...@gmail.com>
---
mm/slob.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/mm/slob.c b/mm/slob.c
index fffbc82..a65e802 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -320,6 +320,9 @@ static void *slob_alloc(size_t size, gfp_t gfp, int align,
int node)
sp = virt_to_page(b);
__SetPageSlab(sp);
+ /* Slob allocations are never flagged reclaimable */
+ inc_zone_page_state(sp, NR_SLAB_UNRECLAIMABLE);
+
spin_lock_irqsave(&slob_lock, flags);
sp->units = SLOB_UNITS(PAGE_SIZE);
sp->freelist = b;
@@ -361,6 +364,9 @@ static void slob_free(void *block, int size)
clear_slob_page_free(sp);
spin_unlock_irqrestore(&slob_lock, flags);
__ClearPageSlab(sp);
+
+ dec_zone_page_state(sp, NR_SLAB_UNRECLAIMABLE);
+
reset_page_mapcount(sp);
slob_free_pages(b, 0);
return;
--
1.7.8.6
--
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