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Message-ID: <20241011055700.4142694-1-howardchu95@gmail.com>
Date: Thu, 10 Oct 2024 22:57:00 -0700
From: Howard Chu <howardchu95@...il.com>
To: peterz@...radead.org
Cc: mingo@...hat.com,
acme@...nel.org,
namhyung@...nel.org,
mark.rutland@....com,
alexander.shishkin@...ux.intel.com,
jolsa@...nel.org,
irogers@...gle.com,
adrian.hunter@...el.com,
matt@...dmodwrite.com,
kan.liang@...ux.intel.com,
linux-perf-users@...r.kernel.org,
linux-kernel@...r.kernel.org,
Howard Chu <howardchu95@...il.com>
Subject: [PATCH] perf test: Delete unused Intel CQM test
As Ian Rogers <irogers@...gle.com> pointed out, intel-cqm.c is neither
used nor built. It was deleted in the following commit:
commit b24413180f56 ("License cleanup: add SPDX GPL-2.0 license identifier to files with no license")
However, it resurfaced soon after in the following commit:
commit 5c9295bfe6f5 ("perf tests: Remove Intel CQM perf test")
It should be deleted once and for all.
Suggested-by: Ian Rogers <irogers@...gle.com>
Signed-off-by: Howard Chu <howardchu95@...il.com>
---
tools/perf/arch/x86/tests/intel-cqm.c | 128 --------------------------
1 file changed, 128 deletions(-)
delete mode 100644 tools/perf/arch/x86/tests/intel-cqm.c
diff --git a/tools/perf/arch/x86/tests/intel-cqm.c b/tools/perf/arch/x86/tests/intel-cqm.c
deleted file mode 100644
index 360a082fc928..000000000000
--- a/tools/perf/arch/x86/tests/intel-cqm.c
+++ /dev/null
@@ -1,128 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include "tests/tests.h"
-#include "cloexec.h"
-#include "debug.h"
-#include "evlist.h"
-#include "evsel.h"
-#include "arch-tests.h"
-#include <internal/lib.h> // page_size
-
-#include <signal.h>
-#include <sys/mman.h>
-#include <sys/wait.h>
-#include <errno.h>
-#include <string.h>
-
-static pid_t spawn(void)
-{
- pid_t pid;
-
- pid = fork();
- if (pid)
- return pid;
-
- while(1)
- sleep(5);
- return 0;
-}
-
-/*
- * Create an event group that contains both a sampled hardware
- * (cpu-cycles) and software (intel_cqm/llc_occupancy/) event. We then
- * wait for the hardware perf counter to overflow and generate a PMI,
- * which triggers an event read for both of the events in the group.
- *
- * Since reading Intel CQM event counters requires sending SMP IPIs, the
- * CQM pmu needs to handle the above situation gracefully, and return
- * the last read counter value to avoid triggering a WARN_ON_ONCE() in
- * smp_call_function_many() caused by sending IPIs from NMI context.
- */
-int test__intel_cqm_count_nmi_context(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
-{
- struct evlist *evlist = NULL;
- struct evsel *evsel = NULL;
- struct perf_event_attr pe;
- int i, fd[2], flag, ret;
- size_t mmap_len;
- void *event;
- pid_t pid;
- int err = TEST_FAIL;
-
- flag = perf_event_open_cloexec_flag();
-
- evlist = evlist__new();
- if (!evlist) {
- pr_debug("evlist__new failed\n");
- return TEST_FAIL;
- }
-
- ret = parse_event(evlist, "intel_cqm/llc_occupancy/");
- if (ret) {
- pr_debug("parse_events failed, is \"intel_cqm/llc_occupancy/\" available?\n");
- err = TEST_SKIP;
- goto out;
- }
-
- evsel = evlist__first(evlist);
- if (!evsel) {
- pr_debug("evlist__first failed\n");
- goto out;
- }
-
- memset(&pe, 0, sizeof(pe));
- pe.size = sizeof(pe);
-
- pe.type = PERF_TYPE_HARDWARE;
- pe.config = PERF_COUNT_HW_CPU_CYCLES;
- pe.read_format = PERF_FORMAT_GROUP;
-
- pe.sample_period = 128;
- pe.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_READ;
-
- pid = spawn();
-
- fd[0] = sys_perf_event_open(&pe, pid, -1, -1, flag);
- if (fd[0] < 0) {
- pr_debug("failed to open event\n");
- goto out;
- }
-
- memset(&pe, 0, sizeof(pe));
- pe.size = sizeof(pe);
-
- pe.type = evsel->attr.type;
- pe.config = evsel->attr.config;
-
- fd[1] = sys_perf_event_open(&pe, pid, -1, fd[0], flag);
- if (fd[1] < 0) {
- pr_debug("failed to open event\n");
- goto out;
- }
-
- /*
- * Pick a power-of-two number of pages + 1 for the meta-data
- * page (struct perf_event_mmap_page). See tools/perf/design.txt.
- */
- mmap_len = page_size * 65;
-
- event = mmap(NULL, mmap_len, PROT_READ, MAP_SHARED, fd[0], 0);
- if (event == (void *)(-1)) {
- pr_debug("failed to mmap %d\n", errno);
- goto out;
- }
-
- sleep(1);
-
- err = TEST_OK;
-
- munmap(event, mmap_len);
-
- for (i = 0; i < 2; i++)
- close(fd[i]);
-
- kill(pid, SIGKILL);
- wait(NULL);
-out:
- evlist__delete(evlist);
- return err;
-}
--
2.43.0
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