This is a note to let you know that I've just added the patch titled
selftests/resctrl: Close perf value read fd on errors
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
selftests-resctrl-close-perf-value-read-fd-on-errors.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 858279f5a1d3c1f2a86035bcf00405e91c27bc93
Author: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Date: Mon Jul 17 16:14:52 2023 +0300
selftests/resctrl: Close perf value read fd on errors
[ Upstream commit 51a0c3b7f028169e40db930575dd01fe81c3e765 ]
Perf event fd (fd_lm) is not closed when run_fill_buf() returns error.
Close fd_lm only in cat_val() to make it easier to track it is always
closed.
Fixes: 790bf585b0ee ("selftests/resctrl: Add Cache Allocation Technology (CAT) selftest")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Tested-by: Babu Moger <babu.moger@xxxxxxx>
Tested-by: Shaopeng Tan (Fujitsu) <tan.shaopeng@xxxxxxxxxxx>
Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
index 8a4fe8693be63..289b619116fec 100644
--- a/tools/testing/selftests/resctrl/cache.c
+++ b/tools/testing/selftests/resctrl/cache.c
@@ -87,21 +87,19 @@ static int reset_enable_llc_perf(pid_t pid, int cpu_no)
static int get_llc_perf(unsigned long *llc_perf_miss)
{
__u64 total_misses;
+ int ret;
/* Stop counters after one span to get miss rate */
ioctl(fd_lm, PERF_EVENT_IOC_DISABLE, 0);
- if (read(fd_lm, &rf_cqm, sizeof(struct read_format)) == -1) {
+ ret = read(fd_lm, &rf_cqm, sizeof(struct read_format));
+ if (ret == -1) {
perror("Could not get llc misses through perf");
-
return -1;
}
total_misses = rf_cqm.values[0].value;
-
- close(fd_lm);
-
*llc_perf_miss = total_misses;
return 0;
@@ -253,19 +251,25 @@ int cat_val(struct resctrl_val_param *param)
memflush, operation, resctrl_val)) {
fprintf(stderr, "Error-running fill buffer\n");
ret = -1;
- break;
+ goto pe_close;
}
sleep(1);
ret = measure_cache_vals(param, bm_pid);
if (ret)
- break;
+ goto pe_close;
+
+ close(fd_lm);
} else {
break;
}
}
return ret;
+
+pe_close:
+ close(fd_lm);
+ return ret;
}
/*
