linux-kernel - [PATCH 1/2] mm/slob: Mark zone page state to get slab usage at /proc/meminfo

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Date:	Mon, 22 Oct 2012 09:03:54 -0300
From:	Ezequiel Garcia <elezegarcia@...il.com>
To:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Cc:	Tim Bird <tim.bird@...sony.com>,
	Ezequiel Garcia <elezegarcia@...il.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>
Subject: [PATCH 1/2] mm/slob: Mark zone page state to get slab usage at /proc/meminfo

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 <cl@...ux-foundation.org>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: Matt Mackall <mpm@...enic.com>
Signed-off-by: Ezequiel Garcia <elezegarcia@...il.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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