From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Lameter Subject: [patch 05/12] Slab defragmentation: Log information to the syslog to show defrag operations Date: Sat, 07 Jul 2007 20:05:43 -0700 Message-ID: <20070708030844.569230197@sgi.com> References: <20070708030538.729027694@sgi.com> Return-path: Content-Disposition: inline; filename=slub_defrag_tracing Sender: linux-kernel-owner@vger.kernel.org To: akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, dgc@sgi.com List-Id: linux-mm.kvack.org Dump information into the syslog during defragmentation actions to show that something is occurring and what effect it has. This is likely only useful in mm for testing and verification. Signed-off-by: Christoph Lameter --- mm/slub.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) Index: linux-2.6.22-rc6-mm1/mm/slub.c =================================================================== --- linux-2.6.22-rc6-mm1.orig/mm/slub.c 2007-07-06 20:04:54.000000000 -0700 +++ linux-2.6.22-rc6-mm1/mm/slub.c 2007-07-06 20:06:45.000000000 -0700 @@ -2599,6 +2599,8 @@ static unsigned long sort_partial_list(s return freed; } +#define NR_INUSE 40 + /* * Shrink the slab cache on a particular node of the cache */ @@ -2610,6 +2612,8 @@ static unsigned long __kmem_cache_shrink LIST_HEAD(zaplist); int freed; int inuse; + int nr[NR_INUSE] = { 0, }; + int i; spin_lock_irqsave(&n->list_lock, flags); freed = sort_partial_list(s, n, scratch); @@ -2646,6 +2650,8 @@ static unsigned long __kmem_cache_shrink n->nr_partial--; SetSlabFrozen(page); slab_unlock(page); + if (inuse < NR_INUSE) + nr[inuse]++; } spin_unlock_irqrestore(&n->list_lock, flags); @@ -2659,6 +2665,13 @@ static unsigned long __kmem_cache_shrink if (__kmem_cache_vacate(s, page, flags, scratch) == 0) freed++; } + printk(KERN_INFO "Slab %s: Defrag freed %d pages. PartSlab config=", + s->name, freed << s->order); + + for (i = 0; i < NR_INUSE; i++) + if (nr[i]) + printk(" %d=%d", i, nr[i]); + printk("\n"); return freed; } --