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authorStephane Eranian <eranian@google.com>2010-05-17 12:20:43 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2010-05-17 12:23:18 -0300
commit3de29cab1f8d62db557a4afed0fb17eebfe64438 (patch)
tree6e1688a1bf0bff8a85cebc6e9c7edb1300e2cd20 /tools/perf/builtin-record.c
parent6ba85cea872954a36d79e46bf6a9c6ea92794f01 (diff)
downloadlinux-2.6.34-ux500-3de29cab1f8d62db557a4afed0fb17eebfe64438.tar.gz
perf record: Fix bug mismatch with -c option definition
The -c option defines the user requested sampling period. It was implemented using an unsigned int variable but the type of the option was OPT_LONG. Thus, the option parser was overwriting memory belonging to other variables, namely the mmap_pages leading to a zero page sampling buffer. The bug was exposed only when compiling at -O0, probably because the compiler was padding variables at higher optimization levels. This patch fixes this problem by declaring user_interval as u64. This also avoids wrap-around issues for large period on 32-bit systems. Commiter note: Made it use OPT_U64(user_interval) after implementing OPT_U64 in the previous patch. Cc: David S. Miller <davem@davemloft.net> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <4bf11ae9.e88cd80a.06b0.ffffa8e3@mx.google.com> Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-record.c')
-rw-r--r--tools/perf/builtin-record.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 0f467cf7aa7..b93573c7ac0 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -33,8 +33,8 @@ enum write_mode_t {
static int *fd[MAX_NR_CPUS][MAX_COUNTERS];
-static unsigned int user_interval = UINT_MAX;
-static long default_interval = 0;
+static u64 user_interval = ULLONG_MAX;
+static u64 default_interval = 0;
static int nr_cpus = 0;
static unsigned int page_size;
@@ -268,7 +268,7 @@ static void create_counter(int counter, int cpu)
* it a weak assumption overridable by the user.
*/
if (!attr->sample_period || (user_freq != UINT_MAX &&
- user_interval != UINT_MAX)) {
+ user_interval != ULLONG_MAX)) {
if (freq) {
attr->sample_type |= PERF_SAMPLE_PERIOD;
attr->freq = 1;
@@ -817,8 +817,7 @@ static const struct option options[] = {
"CPU to profile on"),
OPT_BOOLEAN('f', "force", &force,
"overwrite existing data file (deprecated)"),
- OPT_LONG('c', "count", &user_interval,
- "event period to sample"),
+ OPT_U64('c', "count", &user_interval, "event period to sample"),
OPT_STRING('o', "output", &output_name, "file",
"output file name"),
OPT_BOOLEAN('i', "no-inherit", &no_inherit,
@@ -901,7 +900,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
if (!event_array)
return -ENOMEM;
- if (user_interval != UINT_MAX)
+ if (user_interval != ULLONG_MAX)
default_interval = user_interval;
if (user_freq != UINT_MAX)
freq = user_freq;