From: Xunlei Pang <xlpang@linux.alibaba.com>
To: Christoph Lameter <cl@linux.com>,
Christoph Lameter <cl@gentwo.de>,
Pekka Enberg <penberg@kernel.org>,
Vlastimil Babka <vbabka@suse.cz>, Roman Gushchin <guro@fb.com>,
Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
David Rientjes <rientjes@google.com>,
Matthew Wilcox <willy@infradead.org>,
Shu Ming <sming56@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Wen Yang <wenyang@linux.alibaba.com>,
James Wang <jnwang@linux.alibaba.com>,
Xunlei Pang <xlpang@linux.alibaba.com>
Subject: [PATCH v4 3/3] mm/slub: Get rid of count_partial()
Date: Wed, 17 Mar 2021 15:54:52 +0800 [thread overview]
Message-ID: <1615967692-80524-4-git-send-email-xlpang@linux.alibaba.com> (raw)
In-Reply-To: <1615967692-80524-1-git-send-email-xlpang@linux.alibaba.com>
Now the partial counters are ready, let's use them to get rid
of count_partial().
The partial counters will involve in to calculate the accurate
partial usage when CONFIG_SLUB_DEBUG_PARTIAL is on, otherwise
simply assume their zero usage statistics.
Tested-by: James Wang <jnwang@linux.alibaba.com>
Signed-off-by: Xunlei Pang <xlpang@linux.alibaba.com>
---
mm/slub.c | 64 +++++++++++++++++++++++++++++++--------------------------------
1 file changed, 31 insertions(+), 33 deletions(-)
diff --git a/mm/slub.c b/mm/slub.c
index 856aea4..9bff669 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2533,11 +2533,6 @@ static inline int node_match(struct page *page, int node)
}
#ifdef CONFIG_SLUB_DEBUG
-static int count_free(struct page *page)
-{
- return page->objects - page->inuse;
-}
-
static inline unsigned long node_nr_objs(struct kmem_cache_node *n)
{
return atomic_long_read(&n->total_objects);
@@ -2545,18 +2540,33 @@ static inline unsigned long node_nr_objs(struct kmem_cache_node *n)
#endif /* CONFIG_SLUB_DEBUG */
#if defined(CONFIG_SLUB_DEBUG) || defined(CONFIG_SYSFS)
-static unsigned long count_partial(struct kmem_cache_node *n,
- int (*get_count)(struct page *))
+enum partial_item { PARTIAL_FREE, PARTIAL_INUSE, PARTIAL_TOTAL, PARTIAL_SLAB };
+
+static unsigned long partial_counter(struct kmem_cache_node *n,
+ enum partial_item item)
{
- unsigned long flags;
- unsigned long x = 0;
- struct page *page;
+ unsigned long ret = 0;
- spin_lock_irqsave(&n->list_lock, flags);
- list_for_each_entry(page, &n->partial, slab_list)
- x += get_count(page);
- spin_unlock_irqrestore(&n->list_lock, flags);
- return x;
+#ifdef CONFIG_SLUB_DEBUG_PARTIAL
+ if (item == PARTIAL_FREE) {
+ ret = per_cpu_sum(*n->partial_free_objs);
+ if ((long)ret < 0)
+ ret = 0;
+ } else if (item == PARTIAL_TOTAL) {
+ ret = n->partial_total_objs;
+ } else if (item == PARTIAL_INUSE) {
+ ret = per_cpu_sum(*n->partial_free_objs);
+ if ((long)ret < 0)
+ ret = 0;
+ ret = n->partial_total_objs - ret;
+ if ((long)ret < 0)
+ ret = 0;
+ } else { /* item == PARTIAL_SLAB */
+ ret = n->nr_partial;
+ }
+#endif
+
+ return ret;
}
#endif /* CONFIG_SLUB_DEBUG || CONFIG_SYSFS */
@@ -2587,7 +2597,7 @@ static unsigned long count_partial(struct kmem_cache_node *n,
unsigned long nr_objs;
unsigned long nr_free;
- nr_free = count_partial(n, count_free);
+ nr_free = partial_counter(n, PARTIAL_FREE);
nr_slabs = node_nr_slabs(n);
nr_objs = node_nr_objs(n);
@@ -4654,18 +4664,6 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
EXPORT_SYMBOL(__kmalloc_node_track_caller);
#endif
-#ifdef CONFIG_SYSFS
-static int count_inuse(struct page *page)
-{
- return page->inuse;
-}
-
-static int count_total(struct page *page)
-{
- return page->objects;
-}
-#endif
-
#ifdef CONFIG_SLUB_DEBUG
static void validate_slab(struct kmem_cache *s, struct page *page)
{
@@ -5102,7 +5100,7 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
x = atomic_long_read(&n->total_objects);
else if (flags & SO_OBJECTS)
x = atomic_long_read(&n->total_objects) -
- count_partial(n, count_free);
+ partial_counter(n, PARTIAL_FREE);
else
x = atomic_long_read(&n->nr_slabs);
total += x;
@@ -5116,11 +5114,11 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
for_each_kmem_cache_node(s, node, n) {
if (flags & SO_TOTAL)
- x = count_partial(n, count_total);
+ x = partial_counter(n, PARTIAL_TOTAL);
else if (flags & SO_OBJECTS)
- x = count_partial(n, count_inuse);
+ x = partial_counter(n, PARTIAL_INUSE);
else
- x = n->nr_partial;
+ x = partial_counter(n, PARTIAL_SLAB);
total += x;
nodes[node] += x;
}
@@ -5884,7 +5882,7 @@ void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo)
for_each_kmem_cache_node(s, node, n) {
nr_slabs += node_nr_slabs(n);
nr_objs += node_nr_objs(n);
- nr_free += count_partial(n, count_free);
+ nr_free += partial_counter(n, PARTIAL_FREE);
}
sinfo->active_objs = nr_objs - nr_free;
--
1.8.3.1
prev parent reply other threads:[~2021-03-17 7:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-17 7:54 [PATCH v4 0/3] mm/slub: Fix count_partial() problem Xunlei Pang
2021-03-17 7:54 ` [PATCH v4 1/3] mm/slub: Introduce two counters for partial objects Xunlei Pang
2021-03-17 18:45 ` Vlastimil Babka
2021-03-18 4:52 ` Xunlei Pang
2021-03-18 12:18 ` Vlastimil Babka
2021-03-18 12:56 ` Xunlei Pang
2021-03-22 1:46 ` Shu Ming
2021-03-22 10:22 ` Vlastimil Babka
2021-03-29 1:58 ` Shu Ming
2021-03-17 7:54 ` [PATCH v4 2/3] percpu: Export per_cpu_sum() Xunlei Pang
2021-03-17 7:54 ` Xunlei Pang [this message]
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