slub: per cpu partial statistics change
This patch split the cpu_partial_free into 2 parts: cpu_partial_node, PCP refilling times from node partial; and same name cpu_partial_free, PCP refilling times in slab_free slow path. A new statistic 'cpu_partial_drain' is added to get PCP drain to node partial times. These info are useful when do PCP tunning. The slabinfo.c code is unchanged, since cpu_partial_node is not on slow path. Signed-off-by: Alex Shi <alex.shi@intel.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
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4de900b4d6
Коммит
8028dcea8a
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@ -21,7 +21,7 @@ enum stat_item {
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FREE_FROZEN, /* Freeing to frozen slab */
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FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */
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FREE_REMOVE_PARTIAL, /* Freeing removes last object */
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ALLOC_FROM_PARTIAL, /* Cpu slab acquired from partial list */
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ALLOC_FROM_PARTIAL, /* Cpu slab acquired from node partial list */
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ALLOC_SLAB, /* Cpu slab acquired from page allocator */
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ALLOC_REFILL, /* Refill cpu slab from slab freelist */
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ALLOC_NODE_MISMATCH, /* Switching cpu slab */
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@ -37,7 +37,9 @@ enum stat_item {
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CMPXCHG_DOUBLE_CPU_FAIL,/* Failure of this_cpu_cmpxchg_double */
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CMPXCHG_DOUBLE_FAIL, /* Number of times that cmpxchg double did not match */
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CPU_PARTIAL_ALLOC, /* Used cpu partial on alloc */
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CPU_PARTIAL_FREE, /* USed cpu partial on free */
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CPU_PARTIAL_FREE, /* Refill cpu partial on free */
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CPU_PARTIAL_NODE, /* Refill cpu partial from node partial */
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CPU_PARTIAL_DRAIN, /* Drain cpu partial to node partial */
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NR_SLUB_STAT_ITEMS };
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struct kmem_cache_cpu {
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12
mm/slub.c
12
mm/slub.c
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@ -1566,6 +1566,7 @@ static void *get_partial_node(struct kmem_cache *s,
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} else {
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page->freelist = t;
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available = put_cpu_partial(s, page, 0);
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stat(s, CPU_PARTIAL_NODE);
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}
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if (kmem_cache_debug(s) || available > s->cpu_partial / 2)
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break;
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@ -1979,6 +1980,7 @@ int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
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local_irq_restore(flags);
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pobjects = 0;
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pages = 0;
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stat(s, CPU_PARTIAL_DRAIN);
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}
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}
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@ -1990,7 +1992,6 @@ int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
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page->next = oldpage;
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} while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) != oldpage);
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stat(s, CPU_PARTIAL_FREE);
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return pobjects;
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}
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@ -2474,9 +2475,10 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
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* If we just froze the page then put it onto the
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* per cpu partial list.
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*/
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if (new.frozen && !was_frozen)
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if (new.frozen && !was_frozen) {
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put_cpu_partial(s, page, 1);
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stat(s, CPU_PARTIAL_FREE);
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}
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/*
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* The list lock was not taken therefore no list
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* activity can be necessary.
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@ -5069,6 +5071,8 @@ STAT_ATTR(CMPXCHG_DOUBLE_CPU_FAIL, cmpxchg_double_cpu_fail);
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STAT_ATTR(CMPXCHG_DOUBLE_FAIL, cmpxchg_double_fail);
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STAT_ATTR(CPU_PARTIAL_ALLOC, cpu_partial_alloc);
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STAT_ATTR(CPU_PARTIAL_FREE, cpu_partial_free);
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STAT_ATTR(CPU_PARTIAL_NODE, cpu_partial_node);
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STAT_ATTR(CPU_PARTIAL_DRAIN, cpu_partial_drain);
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#endif
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static struct attribute *slab_attrs[] = {
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@ -5134,6 +5138,8 @@ static struct attribute *slab_attrs[] = {
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&cmpxchg_double_cpu_fail_attr.attr,
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&cpu_partial_alloc_attr.attr,
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&cpu_partial_free_attr.attr,
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&cpu_partial_node_attr.attr,
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&cpu_partial_drain_attr.attr,
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#endif
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#ifdef CONFIG_FAILSLAB
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&failslab_attr.attr,
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