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| author | David Ahern <dsahern@gmail.com> | 2013-11-12 07:46:54 -0700 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-11-12 16:31:53 -0300 |
| commit | 9639837e95db90d056f4683c911717921519320e (patch) | |
| tree | 98eb5457302a6bf58155c5de0fe76b3987314faf /tools | |
| parent | 8973504be70b2986a2081eeff7d9a4210dec295d (diff) | |
| download | linux-9639837e95db90d056f4683c911717921519320e.tar.gz linux-9639837e95db90d056f4683c911717921519320e.tar.bz2 linux-9639837e95db90d056f4683c911717921519320e.zip | |
perf evlist: Round mmap pages to power 2 - v2
Currently perf requires the -m / --mmap_pages option to be a power of 2.
To be more user friendly perf should automatically round this up to the
next power of 2.
Currently:
$ perf record -m 3 -a -- sleep 1
--mmap_pages/-m value must be a power of two.sleep: Terminated
With patch:
$ perf record -m 3 -a -- sleep 1
rounding mmap pages size to 16384 (4 pages)
...
v2: Add bytes units to rounding message per Ingo's request. Other
suggestions (e.g., prefixing INFO) should be addressed by wrapping
pr_info to catch all instances.
Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1384267617-3446-3-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/evlist.c | 18 |
1 files changed, 6 insertions, 12 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 3960560f873a..fb4727d3df85 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -710,7 +710,6 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str, { unsigned int *mmap_pages = opt->value; unsigned long pages, val; - size_t size; static struct parse_tag tags[] = { { .tag = 'B', .mult = 1 }, { .tag = 'K', .mult = 1 << 10 }, @@ -726,11 +725,6 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str, if (val != (unsigned long) -1) { /* we got file size value */ pages = PERF_ALIGN(val, page_size) / page_size; - if (pages < (1UL << 31) && !is_power_of_2(pages)) { - pages = next_pow2(pages); - pr_info("rounding mmap pages size to %lu (%lu pages)\n", - pages * page_size, pages); - } } else { /* we got pages count value */ char *eptr; @@ -741,14 +735,14 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str, } } - if (pages > UINT_MAX || pages > SIZE_MAX / page_size) { - pr_err("--mmap_pages/-m value too big\n"); - return -1; + if (pages < (1UL << 31) && !is_power_of_2(pages)) { + pages = next_pow2(pages); + pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n", + pages * page_size, pages); } - size = perf_evlist__mmap_size(pages); - if (!size) { - pr_err("--mmap_pages/-m value must be a power of two."); + if (pages > UINT_MAX || pages > SIZE_MAX / page_size) { + pr_err("--mmap_pages/-m value too big\n"); return -1; } |