Messages in this thread Patch in this message | | | From | Glauber Costa <> | Subject | [PATCH 2/6] cgroup: implement CFTYPE_NO_PREFIX | Date | Tue, 20 Nov 2012 12:32:00 +0400 |
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From: Tejun Heo <tj@kernel.org>
When cgroup files are created, cgroup core automatically prepends the name of the subsystem as prefix. This patch adds CFTYPE_NO_PREFIX which disables the automatic prefix.
This will be used to deprecate cpuacct which will make cpu create and serve the cpuacct files.
Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Glauber Costa <glommer@parallels.com> --- include/linux/cgroup.h | 1 + kernel/cgroup.c | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index a178a91..018468b 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -272,6 +272,7 @@ struct cgroup_map_cb { /* cftype->flags */ #define CFTYPE_ONLY_ON_ROOT (1U << 0) /* only create on root cg */ #define CFTYPE_NOT_ON_ROOT (1U << 1) /* don't create onp root cg */ +#define CFTYPE_NO_PREFIX (1U << 2) /* skip subsys prefix */ #define MAX_CFTYPE_NAME 64 diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 3d68aad..4081fee 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -2629,7 +2629,8 @@ static int cgroup_add_file(struct cgroup *cgrp, struct cgroup_subsys *subsys, if ((cft->flags & CFTYPE_ONLY_ON_ROOT) && cgrp->parent) return 0; - if (subsys && !test_bit(ROOT_NOPREFIX, &cgrp->root->flags)) { + if (subsys && !(cft->flags & CFTYPE_NO_PREFIX) && + !test_bit(ROOT_NOPREFIX, &cgrp->root->flags)) { strcpy(name, subsys->name); strcat(name, "."); } -- 1.7.11.7
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