Commit-ID: f812d3045c2385ac16237e68b156859c4005526e Gitweb: http://git.kernel.org/tip/f812d3045c2385ac16237e68b156859c4005526e Author: Arnaldo Carvalho de Melo <[email protected]> AuthorDate: Fri, 15 May 2015 16:12:20 -0300 Committer: Arnaldo Carvalho de Melo <[email protected]> CommitDate: Fri, 15 May 2015 16:12:20 -0300
perf cgroup: Use atomic.h for refcounting Now that we have atomic.h, we should convert all of the existing refcounts to use it. Cc: Adrian Hunter <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: David Ahern <[email protected]> Cc: Don Zickus <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Stephane Eranian <[email protected]> Link: http://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- tools/perf/util/cgroup.c | 10 +++------- tools/perf/util/cgroup.h | 4 +++- 2 files changed, 6 insertions(+), 8 deletions(-) diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c index 88f7be3..32e12ec 100644 --- a/tools/perf/util/cgroup.c +++ b/tools/perf/util/cgroup.c @@ -115,23 +115,19 @@ static int add_cgroup(struct perf_evlist *evlist, char *str) goto found; n++; } - if (cgrp->refcnt == 0) + if (atomic_read(&cgrp->refcnt) == 0) free(cgrp); return -1; found: - cgrp->refcnt++; + atomic_inc(&cgrp->refcnt); counter->cgrp = cgrp; return 0; } void close_cgroup(struct cgroup_sel *cgrp) { - if (!cgrp) - return; - - /* XXX: not reentrant */ - if (--cgrp->refcnt == 0) { + if (cgrp && atomic_dec_and_test(&cgrp->refcnt)) { close(cgrp->fd); zfree(&cgrp->name); free(cgrp); diff --git a/tools/perf/util/cgroup.h b/tools/perf/util/cgroup.h index 89acd6d..b4b8cb4 100644 --- a/tools/perf/util/cgroup.h +++ b/tools/perf/util/cgroup.h @@ -1,12 +1,14 @@ #ifndef __CGROUP_H__ #define __CGROUP_H__ +#include <linux/atomic.h> + struct option; struct cgroup_sel { char *name; int fd; - int refcnt; + atomic_t refcnt; }; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
