From 97124d5e2df5b9eaa5bb684bb1e8ebc7e29d0f5d Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Tue, 2 Jun 2009 15:52:24 +0200 Subject: perf_counter: tools: Better handle existing data files Provide an argument (-f) to overwrite existing data files. Signed-off-by: Peter Zijlstra Cc: Mike Galbraith Cc: Paul Mackerras Cc: Corey Ashford Cc: Marcelo Tosatti Cc: Arnaldo Carvalho de Melo Cc: Thomas Gleixner Cc: John Kacur LKML-Reference: Signed-off-by: Ingo Molnar --- Documentation/perf_counter/builtin-record.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) (limited to 'Documentation') diff --git a/Documentation/perf_counter/builtin-record.c b/Documentation/perf_counter/builtin-record.c index 810fc275ca6..bace7a8edf8 100644 --- a/Documentation/perf_counter/builtin-record.c +++ b/Documentation/perf_counter/builtin-record.c @@ -7,6 +7,7 @@ #include "util/parse-events.h" #include "util/string.h" +#include #include #define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1) @@ -26,7 +27,7 @@ static unsigned int realtime_prio = 0; static int system_wide = 0; static pid_t target_pid = -1; static int inherit = 1; -static int nmi = 1; +static int force = 0; const unsigned int default_count[] = { 1000000, @@ -337,7 +338,6 @@ static void open_counters(int cpu, pid_t pid) hw_event.config = event_id[counter]; hw_event.irq_period = event_count[counter]; hw_event.record_type = PERF_RECORD_IP | PERF_RECORD_TID; - hw_event.nmi = nmi; hw_event.mmap = track; hw_event.comm = track; hw_event.inherit = (cpu < 0) && inherit; @@ -387,13 +387,20 @@ static int __cmd_record(int argc, const char **argv) int i, counter; pid_t pid; int ret; + struct stat st; page_size = sysconf(_SC_PAGE_SIZE); nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); assert(nr_cpus <= MAX_NR_CPUS); assert(nr_cpus >= 0); - output = open(output_name, O_CREAT|O_EXCL|O_TRUNC|O_RDWR, S_IRUSR|S_IWUSR); + if (!stat(output_name, &st) && !force) { + fprintf(stderr, "Error, output file: %s exists, use -f to overwrite.\n", + output_name); + exit(-1); + } + + output = open(output_name, O_CREAT|O_TRUNC|O_RDWR, S_IRUSR|S_IWUSR); if (output < 0) { perror("failed to create output file"); exit(-1); @@ -473,6 +480,8 @@ static const struct option options[] = { "collect data with this RT SCHED_FIFO priority"), OPT_BOOLEAN('a', "all-cpus", &system_wide, "system-wide collection from all CPUs"), + OPT_BOOLEAN('f', "force", &force, + "overwrite existing data file"), OPT_END() }; -- cgit v1.2.3