add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/testing/selftests/resctrl/cache.c
..
..
@@ -89,21 +89,19 @@
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 static int get_llc_perf(unsigned long *llc_perf_miss)
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 {
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 	__u64 total_misses;
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+	int ret;
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 	/* Stop counters after one span to get miss rate */
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 	ioctl(fd_lm, PERF_EVENT_IOC_DISABLE, 0);
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-	if (read(fd_lm, &rf_cqm, sizeof(struct read_format)) == -1) {
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+	ret = read(fd_lm, &rf_cqm, sizeof(struct read_format));
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+	if (ret == -1) {
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 		perror("Could not get llc misses through perf");
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-
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 		return -1;
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 	}
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 	total_misses = rf_cqm.values[0].value;
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-
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-	close(fd_lm);
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-
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 	*llc_perf_miss = total_misses;
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 	return 0;
..
..
@@ -256,17 +254,23 @@
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 					 memflush, operation, resctrl_val)) {
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 				fprintf(stderr, "Error-running fill buffer\n");
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 				ret = -1;
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-				break;
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+				goto pe_close;
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 			}
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 			sleep(1);
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 			ret = measure_cache_vals(param, bm_pid);
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 			if (ret)
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-				break;
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+				goto pe_close;
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+
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+			close(fd_lm);
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 		} else {
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 			break;
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 		}
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 	}
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 	return ret;
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+
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+pe_close:
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+	close(fd_lm);
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+	return ret;
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 }