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Message-ID: <20180725112212.GJ13220@kernel.org>
Date: Wed, 25 Jul 2018 08:22:12 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Yury Norov <ynorov@...iumnetworks.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
Kate Stewart <kstewart@...uxfoundation.org>,
Matthew Wilcox <willy@...radead.org>,
Philippe Ombredanne <pombredanne@...b.com>,
David Ahern <dsahern@...il.com>,
David Carrillo-Cisneros <davidcc@...gle.com>,
Andi Kleen <ak@...ux.intel.com>,
Jin Yao <yao.jin@...ux.intel.com>,
linux-kernel@...r.kernel.org,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Mike Snitzer <snitzer@...hat.com>
Subject: Re: [PATCH v2 2/2] bitmap: sync tools with new bitmap allocation API
Em Thu, Jul 05, 2018 at 01:15:53AM +0300, Yury Norov escreveu:
> On top of next-20180622 and Andy Shevchenko series:
> https://lkml.org/lkml/2018/6/18/841
>
> The series https://lkml.org/lkml/2018/6/18/841 introduces helpers for
> bitmap allocation. tools/ has its own bitmap_alloc() which differs from
> bitmap_alloc() proposed in new kernel API, and is equivalent to
> bitmap_zalloc().
>
> In this patch tools is switched to equivalent API. Some bitmap_zalloc()s
> are not paired with corresponding bitmap_free()s, so marked with FIXME tag.
>
> Since v1:
> - removed flags parameter;
> - removed RFC tag: this is real bug where free() is not called;
> - FIXME notes added where needed.
>
> Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>
> ---
> tools/include/linux/bitmap.h | 17 +++++++++++++----
> tools/perf/builtin-c2c.c | 11 ++++++-----
> tools/perf/tests/bitmap.c | 4 ++--
> tools/perf/tests/mem2node.c | 4 ++--
> tools/perf/util/header.c | 8 +++++---
> 5 files changed, 28 insertions(+), 16 deletions(-)
>
> diff --git a/tools/include/linux/bitmap.h b/tools/include/linux/bitmap.h
> index 48c208437bbd..64a87921bac8 100644
> --- a/tools/include/linux/bitmap.h
> +++ b/tools/include/linux/bitmap.h
> @@ -98,12 +98,21 @@ static inline int test_and_set_bit(int nr, unsigned long *addr)
> }
>
> /**
> - * bitmap_alloc - Allocate bitmap
> - * @nbits: Number of bits
> + * Allocation and deallocation of bitmap.
> */
> -static inline unsigned long *bitmap_alloc(int nbits)
> +static inline unsigned long *bitmap_alloc(unsigned int nbits)
> {
> - return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
> + return malloc(BITS_TO_LONGS(nbits) * sizeof(unsigned long));
> +}
> +
> +static inline unsigned long *bitmap_zalloc(unsigned int nbits)
> +{
> + return calloc(BITS_TO_LONGS(nbits), sizeof(unsigned long));
> +}
> +
> +static inline void bitmap_free(const unsigned long *bitmap)
> +{
> + free((unsigned long *)bitmap);
> }
So the patch should be split into at least two, one that introduces
bitmap_zalloc() and bitmap_free(), and then another patch that converts
things to zalloc when needed, other patches adding bitmap_free() where
its missing, etc.
- Arnaldo
p.s. cleaning up inbox after vacation.
>
> /*
> diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
> index 6a8738f7ead3..584abe437154 100644
> --- a/tools/perf/builtin-c2c.c
> +++ b/tools/perf/builtin-c2c.c
> @@ -127,11 +127,11 @@ static void *c2c_he_zalloc(size_t size)
> if (!c2c_he)
> return NULL;
>
> - c2c_he->cpuset = bitmap_alloc(c2c.cpus_cnt);
> + c2c_he->cpuset = bitmap_zalloc(c2c.cpus_cnt);
> if (!c2c_he->cpuset)
> return NULL;
>
> - c2c_he->nodeset = bitmap_alloc(c2c.nodes_cnt);
> + c2c_he->nodeset = bitmap_zalloc(c2c.nodes_cnt);
> if (!c2c_he->nodeset)
> return NULL;
>
> @@ -156,8 +156,8 @@ static void c2c_he_free(void *he)
> free(c2c_he->hists);
> }
>
> - free(c2c_he->cpuset);
> - free(c2c_he->nodeset);
> + bitmap_free(c2c_he->cpuset);
> + bitmap_free(c2c_he->nodeset);
> free(c2c_he->nodestr);
> free(c2c_he->node_stats);
> free(c2c_he);
> @@ -2051,7 +2051,8 @@ static int setup_nodes(struct perf_session *session)
> struct cpu_map *map = n[node].map;
> unsigned long *set;
>
> - set = bitmap_alloc(c2c.cpus_cnt);
> + /* FIXME: No counterpart free() */
> + set = bitmap_zalloc(c2c.cpus_cnt);
> if (!set)
> return -ENOMEM;
>
> diff --git a/tools/perf/tests/bitmap.c b/tools/perf/tests/bitmap.c
> index 96e7fc1ad3f9..0f7491a4e0f2 100644
> --- a/tools/perf/tests/bitmap.c
> +++ b/tools/perf/tests/bitmap.c
> @@ -13,7 +13,7 @@ static unsigned long *get_bitmap(const char *str, int nbits)
> unsigned long *bm = NULL;
> int i;
>
> - bm = bitmap_alloc(nbits);
> + bm = bitmap_zalloc(nbits);
>
> if (map && bm) {
> for (i = 0; i < map->nr; i++)
> @@ -35,7 +35,7 @@ static int test_bitmap(const char *str)
> pr_debug("bitmap: %s\n", buf);
>
> ret = !strcmp(buf, str);
> - free(bm);
> + bitmap_free(bm);
> return ret;
> }
>
> diff --git a/tools/perf/tests/mem2node.c b/tools/perf/tests/mem2node.c
> index d8e3d49d3638..27fd83bab453 100644
> --- a/tools/perf/tests/mem2node.c
> +++ b/tools/perf/tests/mem2node.c
> @@ -21,7 +21,7 @@ static unsigned long *get_bitmap(const char *str, int nbits)
> unsigned long *bm = NULL;
> int i;
>
> - bm = bitmap_alloc(nbits);
> + bm = bitmap_zalloc(nbits);
>
> if (map && bm) {
> for (i = 0; i < map->nr; i++)
> @@ -65,7 +65,7 @@ int test__mem2node(struct test *t __maybe_unused, int subtest __maybe_unused)
> T("failed: mem2node__node", -1 == mem2node__node(&map, 0x1050));
>
> for (i = 0; i < ARRAY_SIZE(nodes); i++)
> - free(nodes[i].set);
> + bitmap_free(nodes[i].set);
>
> mem2node__exit(&map);
> return 0;
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index 3a6bec22baa3..8736c70ffb51 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -275,7 +275,8 @@ static int do_read_bitmap(struct feat_fd *ff, unsigned long **pset, u64 *psize)
> if (ret)
> return ret;
>
> - set = bitmap_alloc(size);
> + /* FIXME: No counterpart free() */
> + set = bitmap_zalloc(size);
> if (!set)
> return -ENOMEM;
>
> @@ -284,7 +285,7 @@ static int do_read_bitmap(struct feat_fd *ff, unsigned long **pset, u64 *psize)
> for (i = 0; (u64) i < BITS_TO_U64(size); i++) {
> ret = do_read_u64(ff, p + i);
> if (ret < 0) {
> - free(set);
> + bitmap_free(set);
> return ret;
> }
> }
> @@ -1277,7 +1278,8 @@ static int memory_node__read(struct memory_node *n, unsigned long idx)
>
> size++;
>
> - n->set = bitmap_alloc(size);
> + /* FIXME: No counterpart free() */
> + n->set = bitmap_zalloc(size);
> if (!n->set) {
> closedir(dir);
> return -ENOMEM;
> --
> 2.17.1
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