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Date: Sat, 27 Aug 2011 00:28:15 +0800 From: Zhao Jin <cronozhj@...il.com> To: cl@...ux-foundation.org, penberg@...nel.org, mpm@...enic.com Cc: linux-kernel@...r.kernel.org, Zhao Jin <cronozhj@...il.com> Subject: [PATCH 2/2][RESEND] slab: avoid unnecessary touching of a partial slab In cache_alloc_refill(), after refilling from a partial slab, if the slab remains partial, it would be deleted from and then added again to the partial list. As the slab is the first element in the list before deletion, such behavior has no effect. This patch avoids touching the slab in this case. Signed-off-by: Zhao Jin <cronozhj@...il.com> --- mm/slab.c | 7 +++---- 1 files changed, 3 insertions(+), 4 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index 82e0a0e..2d7a0f4 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3121,11 +3121,10 @@ retry: check_slabp(cachep, slabp); /* move slabp to correct slabp list: */ - list_del(&slabp->list); if (slabp->free == BUFCTL_END) - list_add(&slabp->list, &l3->slabs_full); - else - list_add(&slabp->list, &l3->slabs_partial); + list_move(entry, &l3->slabs_full); + else if (entry != l3->slabs_partial.next) + list_move(entry, &l3->slabs_partial); } must_grow: -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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