From 27050f530dc4fd88dc93d85c177e000efe970d12 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Sun, 1 Sep 2013 12:36:13 +0200 Subject: [PATCH] perf tools: Add possibility to specify mmap size Adding possibility to specify mmap size via -m/--mmap-pages by appending unit size character (B/K/M/G) to the number, like: $ perf record -m 8K ls $ perf record -m 2M ls The size is rounded up appropriately to follow perf mmap restrictions. If no unit is specified the number provides pages as of now, like: $ perf record -m 8 ls Signed-off-by: Jiri Olsa Cc: Andi Kleen Cc: Corey Ashford Cc: David Ahern Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1378031796-17892-3-git-send-email-jolsa@redhat.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-kvm.txt | 4 +++- tools/perf/Documentation/perf-record.txt | 4 +++- tools/perf/Documentation/perf-top.txt | 4 +++- tools/perf/Documentation/perf-trace.txt | 4 +++- tools/perf/util/evlist.c | 32 ++++++++++++++++++++++++++------ tools/perf/util/util.c | 25 +++++++++++++++++++++++++ tools/perf/util/util.h | 14 ++++++++++++++ 7 files changed, 77 insertions(+), 10 deletions(-) diff --git a/tools/perf/Documentation/perf-kvm.txt b/tools/perf/Documentation/perf-kvm.txt index ac84db2..6a06cef 100644 --- a/tools/perf/Documentation/perf-kvm.txt +++ b/tools/perf/Documentation/perf-kvm.txt @@ -109,7 +109,9 @@ STAT LIVE OPTIONS -m:: --mmap-pages=:: - Number of mmap data pages. Must be a power of two. + Number of mmap data pages (must be a power of two) or size + specification with appended unit character - B/K/M/G. The + size is rounded up to have nearest pages power of two value. -a:: --all-cpus:: diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index f732eaa..f10ab63 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -87,7 +87,9 @@ OPTIONS -m:: --mmap-pages=:: - Number of mmap data pages. Must be a power of two. + Number of mmap data pages (must be a power of two) or size + specification with appended unit character - B/K/M/G. The + size is rounded up to have nearest pages power of two value. -g:: --call-graph:: diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt index 6d70fbf..f65777c 100644 --- a/tools/perf/Documentation/perf-top.txt +++ b/tools/perf/Documentation/perf-top.txt @@ -68,7 +68,9 @@ Default is to monitor all CPUS. -m :: --mmap-pages=:: - Number of mmapped data pages. + Number of mmap data pages (must be a power of two) or size + specification with appended unit character - B/K/M/G. The + size is rounded up to have nearest pages power of two value. -p :: --pid=:: diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt index 3777385..7f70d36 100644 --- a/tools/perf/Documentation/perf-trace.txt +++ b/tools/perf/Documentation/perf-trace.txt @@ -59,7 +59,9 @@ OPTIONS -m:: --mmap-pages=:: - Number of mmap data pages. Must be a power of two. + Number of mmap data pages (must be a power of two) or size + specification with appended unit character - B/K/M/G. The + size is rounded up to have nearest pages power of two value. -C:: --cpu:: diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 4283f49..d21ab08 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -687,14 +687,33 @@ static size_t perf_evlist__mmap_size(unsigned long pages) int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str, int unset __maybe_unused) { - unsigned int pages, *mmap_pages = opt->value; + unsigned int pages, val, *mmap_pages = opt->value; size_t size; - char *eptr; + static struct parse_tag tags[] = { + { .tag = 'B', .mult = 1 }, + { .tag = 'K', .mult = 1 << 10 }, + { .tag = 'M', .mult = 1 << 20 }, + { .tag = 'G', .mult = 1 << 30 }, + { .tag = 0 }, + }; - pages = strtoul(str, &eptr, 10); - if (*eptr != '\0') { - pr_err("failed to parse --mmap_pages/-m value\n"); - return -1; + val = parse_tag_value(str, tags); + if (val != (unsigned int) -1) { + /* we got file size value */ + pages = PERF_ALIGN(val, page_size) / page_size; + if (!is_power_of_2(pages)) { + pages = next_pow2(pages); + pr_info("rounding mmap pages size to %u (%u pages)\n", + pages * page_size, pages); + } + } else { + /* we got pages count value */ + 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); @@ -738,6 +757,7 @@ int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages, evlist->overwrite = overwrite; evlist->mmap_len = perf_evlist__mmap_size(pages); + pr_debug("mmap size %luB\n", evlist->mmap_len); mask = evlist->mmap_len - page_size - 1; list_for_each_entry(evsel, &evlist->entries, node) { diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c index ccfdeb6..ab71d62 100644 --- a/tools/perf/util/util.c +++ b/tools/perf/util/util.c @@ -361,3 +361,28 @@ int parse_nsec_time(const char *str, u64 *ptime) *ptime = time_sec * NSEC_PER_SEC + time_nsec; return 0; } + +unsigned long parse_tag_value(const char *str, struct parse_tag *tags) +{ + struct parse_tag *i = tags; + + while (i->tag) { + char *s; + + s = strchr(str, i->tag); + if (s) { + unsigned long int value; + char *endptr; + + value = strtoul(str, &endptr, 10); + if (s != endptr) + break; + + value *= i->mult; + return value; + } + i++; + } + + return (unsigned long) -1; +} diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h index a535359..c29ecaa 100644 --- a/tools/perf/util/util.h +++ b/tools/perf/util/util.h @@ -270,6 +270,13 @@ bool is_power_of_2(unsigned long n) return (n != 0 && ((n & (n - 1)) == 0)); } +static inline unsigned next_pow2(unsigned x) +{ + if (!x) + return 1; + return 1ULL << (32 - __builtin_clz(x - 1)); +} + size_t hex_width(u64 v); int hex2u64(const char *ptr, u64 *val); @@ -281,4 +288,11 @@ void dump_stack(void); extern unsigned int page_size; void get_term_dimensions(struct winsize *ws); + +struct parse_tag { + char tag; + int mult; +}; + +unsigned long parse_tag_value(const char *str, struct parse_tag *tags); #endif /* GIT_COMPAT_UTIL_H */ -- 2.7.4