It isn't supposed to stack, so turn it into a bit-field to save 4 bytes
on the task_struct.
Also, remove the memcg_stop/resume_kmem_account helpers - it is clearer
to set/clear the flag inline. Regarding the overwhelming comment to the
helpers, which is removed by this patch too, we already have a compact
yet accurate explanation in memcg_schedule_cache_create, no need in yet
another one.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
---
include/linux/sched.h | 7 +++++--
mm/memcontrol.c | 35 ++---------------------------------
2 files changed, 7 insertions(+), 35 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index ffd1444b087c..8db31ef98d2f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1364,6 +1364,10 @@ struct task_struct {
unsigned sched_reset_on_fork:1;
unsigned sched_contributes_to_load:1;
+#ifdef CONFIG_MEMCG_KMEM
+ unsigned memcg_kmem_skip_account:1;
+#endif
+
unsigned long atomic_flags; /* Flags needing atomic access. */
pid_t pid;
@@ -1679,8 +1683,7 @@ struct task_struct {
/* bitmask and counter of trace recursion */
unsigned long trace_recursion;
#endif /* CONFIG_TRACING */
-#ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
- unsigned int memcg_kmem_skip_account;
+#ifdef CONFIG_MEMCG
struct memcg_oom_info {
struct mem_cgroup *memcg;
gfp_t gfp_mask;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d9fab72da52e..11cbfde4dc6d 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2673,37 +2673,6 @@ static void memcg_unregister_cache(struct kmem_cache *cachep)
css_put(&memcg->css);
}
-/*
- * During the creation a new cache, we need to disable our accounting mechanism
- * altogether. This is true even if we are not creating, but rather just
- * enqueing new caches to be created.
- *
- * This is because that process will trigger allocations; some visible, like
- * explicit kmallocs to auxiliary data structures, name strings and internal
- * cache structures; some well concealed, like INIT_WORK() that can allocate
- * objects during debug.
- *
- * If any allocation happens during memcg_kmem_get_cache, we will recurse back
- * to it. This may not be a bounded recursion: since the first cache creation
- * failed to complete (waiting on the allocation), we'll just try to create the
- * cache again, failing at the same point.
- *
- * memcg_kmem_get_cache is prepared to abort after seeing a positive count of
- * memcg_kmem_skip_account. So we enclose anything that might allocate memory
- * inside the following two functions.
- */
-static inline void memcg_stop_kmem_account(void)
-{
- VM_BUG_ON(!current->mm);
- current->memcg_kmem_skip_account++;
-}
-
-static inline void memcg_resume_kmem_account(void)
-{
- VM_BUG_ON(!current->mm);
- current->memcg_kmem_skip_account--;
-}
-
int __memcg_cleanup_cache_params(struct kmem_cache *s)
{
struct kmem_cache *c;
@@ -2798,9 +2767,9 @@ static void memcg_schedule_register_cache(struct mem_cgroup *memcg,
* this point we can't allow ourselves back into memcg_kmem_get_cache,
* the safest choice is to do it like this, wrapping the whole function.
*/
- memcg_stop_kmem_account();
+ current->memcg_kmem_skip_account = 1;
__memcg_schedule_register_cache(memcg, cachep);
- memcg_resume_kmem_account();
+ current->memcg_kmem_skip_account = 0;
}
int __memcg_charge_slab(struct kmem_cache *cachep, gfp_t gfp, int order)
--
1.7.10.4
--
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