R0dn3yS/android_kernel_xiaomi_sm7250
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cgroup: use kmem_cache pool for struct cgrp_cset_link

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These get allocated and freed millions of times on Android.

Use a dedicated kmem_cache pool and avoid costly dynamic memory allocations.

Signed-off-by: Park Ju Hyung <qkrwngud825@gmail.com>
Signed-off-by: Adam W. Willis <return.of.octobot@gmail.com>
This commit is contained in:
Park Ju Hyung 2019-07-09 21:54:31 +09:00 committed by spakkkk
parent ea73c00adc
commit 096c92b442
1 changed files with 8 additions and 4 deletions
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12
kernel/cgroup/cgroup.c
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@ -711,6 +711,8 @@ EXPORT_SYMBOL_GPL(of_css);
; \
else
static struct kmem_cache *cgrp_cset_link_pool;
/*
* The default css_set - used by init and its children prior to any
* hierarchies being mounted. It contains a pointer to the root state
@ -940,7 +942,7 @@ void put_css_set_locked(struct css_set *cset)
list_del(&link->cgrp_link);
if (cgroup_parent(link->cgrp))
cgroup_put(link->cgrp);
kfree(link);
kmem_cache_free(cgrp_cset_link_pool, link);
}
if (css_set_threaded(cset)) {
@ -1090,7 +1092,7 @@ static void free_cgrp_cset_links(struct list_head *links_to_free)
list_for_each_entry_safe(link, tmp_link, links_to_free, cset_link) {
list_del(&link->cset_link);
kfree(link);
kmem_cache_free(cgrp_cset_link_pool, link);
}
}
@ -1110,7 +1112,7 @@ static int allocate_cgrp_cset_links(int count, struct list_head *tmp_links)
INIT_LIST_HEAD(tmp_links);
for (i = 0; i < count; i++) {
link = kzalloc(sizeof(*link), GFP_KERNEL);
link = kmem_cache_zalloc(cgrp_cset_link_pool, GFP_KERNEL);
if (!link) {
free_cgrp_cset_links(tmp_links);
return -ENOMEM;
@ -1323,7 +1325,7 @@ static void cgroup_destroy_root(struct cgroup_root *root)
list_for_each_entry_safe(link, tmp_link, &cgrp->cset_links, cset_link) {
list_del(&link->cset_link);
list_del(&link->cgrp_link);
kfree(link);
kmem_cache_free(cgrp_cset_link_pool, link);
}
spin_unlock_irq(&css_set_lock);
@ -5697,6 +5699,8 @@ int __init cgroup_init(void)
struct cgroup_subsys *ss;
int ssid;
cgrp_cset_link_pool = KMEM_CACHE(cgrp_cset_link, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
BUILD_BUG_ON(CGROUP_SUBSYS_COUNT > 16);
BUG_ON(percpu_init_rwsem(&cgroup_threadgroup_rwsem));
BUG_ON(cgroup_init_cftypes(NULL, cgroup_base_files));