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author | Jiri Olsa <jolsa@redhat.com> | 2013-09-01 12:36:12 +0200 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-10-09 11:24:10 -0300 |
commit | 994a1f78b191df0c9d6caca3f3afb03e247aff26 (patch) | |
tree | 387ca6391f946bbbca73a579105ee0bc2ba76ad8 /tools/perf/util/evlist.c | |
parent | f37376cd721a539ac398cbb7718b72fce83cd49b (diff) | |
download | linux-stable-994a1f78b191df0c9d6caca3f3afb03e247aff26.tar.gz linux-stable-994a1f78b191df0c9d6caca3f3afb03e247aff26.tar.bz2 linux-stable-994a1f78b191df0c9d6caca3f3afb03e247aff26.zip |
perf tools: Check mmap pages value early
Move the check of the mmap_pages value to the options parsing time, so
we could rely on this value on other parts of code.
Related changes come in the next patches.
Also changes perf_evlist::mmap_len to proper size_t type.
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1378031796-17892-2-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/evlist.c')
-rw-r--r-- | tools/perf/util/evlist.c | 46 |
1 files changed, 37 insertions, 9 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index f9f77bee0b1b..4283f49ca0ab 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -18,6 +18,7 @@ #include <unistd.h> #include "parse-events.h" +#include "parse-options.h" #include <sys/mman.h> @@ -672,6 +673,40 @@ out_unmap: return -1; } +static size_t perf_evlist__mmap_size(unsigned long pages) +{ + /* 512 kiB: default amount of unprivileged mlocked memory */ + if (pages == UINT_MAX) + pages = (512 * 1024) / page_size; + else if (!is_power_of_2(pages)) + return 0; + + return (pages + 1) * page_size; +} + +int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str, + int unset __maybe_unused) +{ + unsigned int pages, *mmap_pages = opt->value; + size_t size; + char *eptr; + + pages = strtoul(str, &eptr, 10); + if (*eptr != '\0') { + pr_err("failed to parse --mmap_pages/-m value\n"); + return -1; + } + + size = perf_evlist__mmap_size(pages); + if (!size) { + pr_err("--mmap_pages/-m value must be a power of two."); + return -1; + } + + *mmap_pages = pages; + return 0; +} + /** perf_evlist__mmap - Create per cpu maps to receive events * * @evlist - list of events @@ -695,14 +730,6 @@ int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages, const struct thread_map *threads = evlist->threads; int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask; - /* 512 kiB: default amount of unprivileged mlocked memory */ - if (pages == UINT_MAX) - pages = (512 * 1024) / page_size; - else if (!is_power_of_2(pages)) - return -EINVAL; - - mask = pages * page_size - 1; - if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0) return -ENOMEM; @@ -710,7 +737,8 @@ int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages, return -ENOMEM; evlist->overwrite = overwrite; - evlist->mmap_len = (pages + 1) * page_size; + evlist->mmap_len = perf_evlist__mmap_size(pages); + mask = evlist->mmap_len - page_size - 1; list_for_each_entry(evsel, &evlist->entries, node) { if ((evsel->attr.read_format & PERF_FORMAT_ID) && |