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Subject[PATCH 085/161] perf tools: Check mmap pages value early
Date
From: Jiri Olsa <jolsa@redhat.com>

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>
---
tools/perf/builtin-kvm.c | 5 +++--
tools/perf/builtin-record.c | 9 +++------
tools/perf/builtin-top.c | 5 +++--
tools/perf/builtin-trace.c | 5 +++--
tools/perf/util/evlist.c | 46 ++++++++++++++++++++++++++++++++++++---------
tools/perf/util/evlist.h | 6 +++++-
6 files changed, 54 insertions(+), 22 deletions(-)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 935d52216c89..cfa0b7979914 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -1426,8 +1426,9 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
const struct option live_options[] = {
OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
"record events on existing process id"),
- OPT_UINTEGER('m', "mmap-pages", &kvm->opts.mmap_pages,
- "number of mmap data pages"),
+ OPT_CALLBACK('m', "mmap-pages", &kvm->opts.mmap_pages, "pages",
+ "number of mmap data pages",
+ perf_evlist__parse_mmap_pages),
OPT_INCR('v', "verbose", &verbose,
"be more verbose (show counter open errors, etc)"),
OPT_BOOLEAN('a', "all-cpus", &kvm->opts.target.system_wide,
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 0aacd6295fe6..92ca5419073b 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -233,10 +233,6 @@ try_again:
"or try again with a smaller value of -m/--mmap_pages.\n"
"(current value: %d)\n", opts->mmap_pages);
rc = -errno;
- } else if (!is_power_of_2(opts->mmap_pages) &&
- (opts->mmap_pages != UINT_MAX)) {
- pr_err("--mmap_pages/-m value must be a power of two.");
- rc = -EINVAL;
} else {
pr_err("failed to mmap with %d (%s)\n", errno, strerror(errno));
rc = -errno;
@@ -854,8 +850,9 @@ const struct option record_options[] = {
OPT_BOOLEAN('i', "no-inherit", &record.opts.no_inherit,
"child tasks do not inherit counters"),
OPT_UINTEGER('F', "freq", &record.opts.user_freq, "profile at this frequency"),
- OPT_UINTEGER('m', "mmap-pages", &record.opts.mmap_pages,
- "number of mmap data pages"),
+ OPT_CALLBACK('m', "mmap-pages", &record.opts.mmap_pages, "pages",
+ "number of mmap data pages",
+ perf_evlist__parse_mmap_pages),
OPT_BOOLEAN(0, "group", &record.opts.group,
"put the counters into a counter group"),
OPT_CALLBACK_DEFAULT('g', "call-graph", &record.opts,
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index b3e0229ee38f..e8466956adbe 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1075,8 +1075,9 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
"file", "vmlinux pathname"),
OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
"hide kernel symbols"),
- OPT_UINTEGER('m', "mmap-pages", &opts->mmap_pages,
- "number of mmap data pages"),
+ OPT_CALLBACK('m', "mmap-pages", &opts->mmap_pages, "pages",
+ "number of mmap data pages",
+ perf_evlist__parse_mmap_pages),
OPT_INTEGER('r', "realtime", &top.realtime_prio,
"collect data with this RT SCHED_FIFO priority"),
OPT_INTEGER('d', "delay", &top.delay_secs,
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index be658433d3bb..f3ddbb008fb4 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1528,8 +1528,9 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
"list of cpus to monitor"),
OPT_BOOLEAN(0, "no-inherit", &trace.opts.no_inherit,
"child tasks do not inherit counters"),
- OPT_UINTEGER('m', "mmap-pages", &trace.opts.mmap_pages,
- "number of mmap data pages"),
+ OPT_CALLBACK('m', "mmap-pages", &trace.opts.mmap_pages, "pages",
+ "number of mmap data pages",
+ perf_evlist__parse_mmap_pages),
OPT_STRING('u', "uid", &trace.opts.target.uid_str, "user",
"user to profile"),
OPT_CALLBACK(0, "duration", &trace, "float",
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) &&
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 880d7139d2fb..4edb5008fd36 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -31,7 +31,7 @@ struct perf_evlist {
int nr_groups;
int nr_fds;
int nr_mmaps;
- int mmap_len;
+ size_t mmap_len;
int id_pos;
int is_pos;
u64 combined_sample_type;
@@ -103,6 +103,10 @@ int perf_evlist__prepare_workload(struct perf_evlist *evlist,
bool want_signal);
int perf_evlist__start_workload(struct perf_evlist *evlist);

+int perf_evlist__parse_mmap_pages(const struct option *opt,
+ const char *str,
+ int unset);
+
int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
bool overwrite);
void perf_evlist__munmap(struct perf_evlist *evlist);
--
1.8.1.4


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