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Use kvmalloc in cgroups-v1

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Instead of using its own logic for k-/vmalloc rely on
kvmalloc which is actually doing quite the same.

Signed-off-by: Marc Koderer <marc@koderer.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Marc Koderer 2019-08-06 15:24:12 +02:00 committed by Tejun Heo
parent a581563f1b
commit 653a23ca7e
1 changed files with 4 additions and 23 deletions
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27
kernel/cgroup/cgroup-v1.c
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@ -193,25 +193,6 @@ struct cgroup_pidlist {
struct delayed_work destroy_dwork; struct delayed_work destroy_dwork;
}; };
/*
* The following two functions "fix" the issue where there are more pids
* than kmalloc will give memory for; in such cases, we use vmalloc/vfree.
* TODO: replace with a kernel-wide solution to this problem
*/
#define PIDLIST_TOO_LARGE(c) ((c) * sizeof(pid_t) > (PAGE_SIZE * 2))
static void *pidlist_allocate(int count)
{
if (PIDLIST_TOO_LARGE(count))
return vmalloc(array_size(count, sizeof(pid_t)));
else
return kmalloc_array(count, sizeof(pid_t), GFP_KERNEL);
}
static void pidlist_free(void *p)
{
kvfree(p);
}
/* /*
* Used to destroy all pidlists lingering waiting for destroy timer. None * Used to destroy all pidlists lingering waiting for destroy timer. None
* should be left afterwards. * should be left afterwards.
@ -244,7 +225,7 @@ static void cgroup_pidlist_destroy_work_fn(struct work_struct *work)
*/ */
if (!delayed_work_pending(dwork)) { if (!delayed_work_pending(dwork)) {
list_del(&l->links); list_del(&l->links);
pidlist_free(l->list); kvfree(l->list);
put_pid_ns(l->key.ns); put_pid_ns(l->key.ns);
tofree = l; tofree = l;
} }
@ -365,7 +346,7 @@ static int pidlist_array_load(struct cgroup *cgrp, enum cgroup_filetype type,
* show up until sometime later on. * show up until sometime later on.
*/ */
length = cgroup_task_count(cgrp); length = cgroup_task_count(cgrp);
array = pidlist_allocate(length); array = kvmalloc_array(length, sizeof(pid_t), GFP_KERNEL);
if (!array) if (!array)
return -ENOMEM; return -ENOMEM;
/* now, populate the array */ /* now, populate the array */
@ -390,12 +371,12 @@ static int pidlist_array_load(struct cgroup *cgrp, enum cgroup_filetype type,
l = cgroup_pidlist_find_create(cgrp, type); l = cgroup_pidlist_find_create(cgrp, type);
if (!l) { if (!l) {
pidlist_free(array); kvfree(array);
return -ENOMEM; return -ENOMEM;
} }
/* store array, freeing old if necessary */ /* store array, freeing old if necessary */
pidlist_free(l->list); kvfree(l->list);
l->list = array; l->list = array;
l->length = length; l->length = length;
*lp = l; *lp = l;