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authorRoman Gushchin <guro@fb.com>2018-06-07 17:06:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-07 17:34:35 -0700
commitbbec2e15170aae3e084d7d9afc730aeebe01b654 (patch)
tree60fae9998aa86f7f004435b133ae55e48a0e2477 /mm/page_counter.c
parent1c4bc43ddfd52cbe5a08bb86ae636f55d2799424 (diff)
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mm: rename page_counter's count/limit into usage/max
This patch renames struct page_counter fields: count -> usage limit -> max and the corresponding functions: page_counter_limit() -> page_counter_set_max() mem_cgroup_get_limit() -> mem_cgroup_get_max() mem_cgroup_resize_limit() -> mem_cgroup_resize_max() memcg_update_kmem_limit() -> memcg_update_kmem_max() memcg_update_tcp_limit() -> memcg_update_tcp_max() The idea behind this renaming is to have the direct matching between memory cgroup knobs (low, high, max) and page_counters API. This is pure renaming, this patch doesn't bring any functional change. Link: http://lkml.kernel.org/r/20180405185921.4942-1-guro@fb.com Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_counter.c')
-rw-r--r--mm/page_counter.c28
1 files changed, 14 insertions, 14 deletions
diff --git a/mm/page_counter.c b/mm/page_counter.c
index 2a8df3ad60a4..41937c9a9d11 100644
--- a/mm/page_counter.c
+++ b/mm/page_counter.c
@@ -22,7 +22,7 @@ void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages)
{
long new;
- new = atomic_long_sub_return(nr_pages, &counter->count);
+ new = atomic_long_sub_return(nr_pages, &counter->usage);
/* More uncharges than charges? */
WARN_ON_ONCE(new < 0);
}
@@ -41,7 +41,7 @@ void page_counter_charge(struct page_counter *counter, unsigned long nr_pages)
for (c = counter; c; c = c->parent) {
long new;
- new = atomic_long_add_return(nr_pages, &c->count);
+ new = atomic_long_add_return(nr_pages, &c->usage);
/*
* This is indeed racy, but we can live with some
* inaccuracy in the watermark.
@@ -82,9 +82,9 @@ bool page_counter_try_charge(struct page_counter *counter,
* we either see the new limit or the setter sees the
* counter has changed and retries.
*/
- new = atomic_long_add_return(nr_pages, &c->count);
- if (new > c->limit) {
- atomic_long_sub(nr_pages, &c->count);
+ new = atomic_long_add_return(nr_pages, &c->usage);
+ if (new > c->max) {
+ atomic_long_sub(nr_pages, &c->usage);
/*
* This is racy, but we can live with some
* inaccuracy in the failcnt.
@@ -123,20 +123,20 @@ void page_counter_uncharge(struct page_counter *counter, unsigned long nr_pages)
}
/**
- * page_counter_limit - limit the number of pages allowed
+ * page_counter_set_max - set the maximum number of pages allowed
* @counter: counter
- * @limit: limit to set
+ * @nr_pages: limit to set
*
* Returns 0 on success, -EBUSY if the current number of pages on the
* counter already exceeds the specified limit.
*
* The caller must serialize invocations on the same counter.
*/
-int page_counter_limit(struct page_counter *counter, unsigned long limit)
+int page_counter_set_max(struct page_counter *counter, unsigned long nr_pages)
{
for (;;) {
unsigned long old;
- long count;
+ long usage;
/*
* Update the limit while making sure that it's not
@@ -149,17 +149,17 @@ int page_counter_limit(struct page_counter *counter, unsigned long limit)
* the limit, so if it sees the old limit, we see the
* modified counter and retry.
*/
- count = atomic_long_read(&counter->count);
+ usage = atomic_long_read(&counter->usage);
- if (count > limit)
+ if (usage > nr_pages)
return -EBUSY;
- old = xchg(&counter->limit, limit);
+ old = xchg(&counter->max, nr_pages);
- if (atomic_long_read(&counter->count) <= count)
+ if (atomic_long_read(&counter->usage) <= usage)
return 0;
- counter->limit = old;
+ counter->max = old;
cond_resched();
}
}