Commit 27050f53 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo

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: default avatarJiri 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/1378031796-17892-3-git-send-email-jolsa@redhat.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 994a1f78
......@@ -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::
......
......@@ -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::
......
......@@ -68,7 +68,9 @@ Default is to monitor all CPUS.
-m <pages>::
--mmap-pages=<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>::
--pid=<pid>::
......
......@@ -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::
......
......@@ -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) {
......
......@@ -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;
}
......@@ -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 */
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