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Message-Id: <20230220124129.519477-8-frederic@kernel.org>
Date: Mon, 20 Feb 2023 13:41:29 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
Frederic Weisbecker <frederic@...nel.org>,
Alexey Dobriyan <adobriyan@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
Wei Li <liwei391@...wei.com>,
Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>,
Yu Liao <liaoyu15@...wei.com>, Hillf Danton <hdanton@...a.com>,
Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 7/7] selftests/proc: Remove idle time monotonicity assertions
Due to broken iowait task counting design (cf: comments above
get_cpu_idle_time_us() and nr_iowait()), it is not possible to provide
the guarantee that /proc/stat or /proc/uptime display monotonic idle
time values.
Remove the selftests that verify the related wrong assumption so that
testers and maintainers don't spend more time on that.
Reported-by: Yu Liao <liaoyu15@...wei.com>
Reported-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Hillf Danton <hdanton@...a.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Wei Li <liwei391@...wei.com>
Cc: Alexey Dobriyan <adobriyan@...il.com>
Cc: Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
tools/testing/selftests/proc/.gitignore | 2 -
tools/testing/selftests/proc/Makefile | 2 -
.../testing/selftests/proc/proc-uptime-001.c | 45 -----------
.../testing/selftests/proc/proc-uptime-002.c | 79 -------------------
tools/testing/selftests/proc/proc-uptime.h | 60 --------------
5 files changed, 188 deletions(-)
delete mode 100644 tools/testing/selftests/proc/proc-uptime-001.c
delete mode 100644 tools/testing/selftests/proc/proc-uptime-002.c
delete mode 100644 tools/testing/selftests/proc/proc-uptime.h
diff --git a/tools/testing/selftests/proc/.gitignore b/tools/testing/selftests/proc/.gitignore
index a156ac5dd2c6..448db45f08dc 100644
--- a/tools/testing/selftests/proc/.gitignore
+++ b/tools/testing/selftests/proc/.gitignore
@@ -13,8 +13,6 @@
/proc-self-wchan
/proc-subset-pid
/proc-tid0
-/proc-uptime-001
-/proc-uptime-002
/read
/self
/setns-dcache
diff --git a/tools/testing/selftests/proc/Makefile b/tools/testing/selftests/proc/Makefile
index cd95369254c0..22ff9341f97c 100644
--- a/tools/testing/selftests/proc/Makefile
+++ b/tools/testing/selftests/proc/Makefile
@@ -16,8 +16,6 @@ TEST_GEN_PROGS += proc-self-syscall
TEST_GEN_PROGS += proc-self-wchan
TEST_GEN_PROGS += proc-subset-pid
TEST_GEN_PROGS += proc-tid0
-TEST_GEN_PROGS += proc-uptime-001
-TEST_GEN_PROGS += proc-uptime-002
TEST_GEN_PROGS += read
TEST_GEN_PROGS += self
TEST_GEN_PROGS += setns-dcache
diff --git a/tools/testing/selftests/proc/proc-uptime-001.c b/tools/testing/selftests/proc/proc-uptime-001.c
deleted file mode 100644
index 781f7a50fc3f..000000000000
--- a/tools/testing/selftests/proc/proc-uptime-001.c
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * Copyright © 2018 Alexey Dobriyan <adobriyan@...il.com>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-// Test that values in /proc/uptime increment monotonically.
-#undef NDEBUG
-#include <assert.h>
-#include <stdint.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-
-#include "proc-uptime.h"
-
-int main(void)
-{
- uint64_t start, u0, u1, i0, i1;
- int fd;
-
- fd = open("/proc/uptime", O_RDONLY);
- assert(fd >= 0);
-
- proc_uptime(fd, &u0, &i0);
- start = u0;
- do {
- proc_uptime(fd, &u1, &i1);
- assert(u1 >= u0);
- assert(i1 >= i0);
- u0 = u1;
- i0 = i1;
- } while (u1 - start < 100);
-
- return 0;
-}
diff --git a/tools/testing/selftests/proc/proc-uptime-002.c b/tools/testing/selftests/proc/proc-uptime-002.c
deleted file mode 100644
index 7d0aa22bdc12..000000000000
--- a/tools/testing/selftests/proc/proc-uptime-002.c
+++ /dev/null
@@ -1,79 +0,0 @@
-/*
- * Copyright © 2018 Alexey Dobriyan <adobriyan@...il.com>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-// Test that values in /proc/uptime increment monotonically
-// while shifting across CPUs.
-#undef NDEBUG
-#include <assert.h>
-#include <errno.h>
-#include <unistd.h>
-#include <sys/syscall.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <stdint.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-
-#include "proc-uptime.h"
-
-static inline int sys_sched_getaffinity(pid_t pid, unsigned int len, unsigned long *m)
-{
- return syscall(SYS_sched_getaffinity, pid, len, m);
-}
-
-static inline int sys_sched_setaffinity(pid_t pid, unsigned int len, unsigned long *m)
-{
- return syscall(SYS_sched_setaffinity, pid, len, m);
-}
-
-int main(void)
-{
- unsigned int len;
- unsigned long *m;
- unsigned int cpu;
- uint64_t u0, u1, i0, i1;
- int fd;
-
- /* find out "nr_cpu_ids" */
- m = NULL;
- len = 0;
- do {
- len += sizeof(unsigned long);
- free(m);
- m = malloc(len);
- } while (sys_sched_getaffinity(0, len, m) == -1 && errno == EINVAL);
-
- fd = open("/proc/uptime", O_RDONLY);
- assert(fd >= 0);
-
- proc_uptime(fd, &u0, &i0);
- for (cpu = 0; cpu < len * 8; cpu++) {
- memset(m, 0, len);
- m[cpu / (8 * sizeof(unsigned long))] |= 1UL << (cpu % (8 * sizeof(unsigned long)));
-
- /* CPU might not exist, ignore error */
- sys_sched_setaffinity(0, len, m);
-
- proc_uptime(fd, &u1, &i1);
- assert(u1 >= u0);
- assert(i1 >= i0);
- u0 = u1;
- i0 = i1;
- }
-
- return 0;
-}
diff --git a/tools/testing/selftests/proc/proc-uptime.h b/tools/testing/selftests/proc/proc-uptime.h
deleted file mode 100644
index dc6a42b1d6b0..000000000000
--- a/tools/testing/selftests/proc/proc-uptime.h
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * Copyright © 2018 Alexey Dobriyan <adobriyan@...il.com>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-#undef NDEBUG
-#include <assert.h>
-#include <errno.h>
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-
-#include "proc.h"
-
-static void proc_uptime(int fd, uint64_t *uptime, uint64_t *idle)
-{
- uint64_t val1, val2;
- char buf[64], *p;
- ssize_t rv;
-
- /* save "p < end" checks */
- memset(buf, 0, sizeof(buf));
- rv = pread(fd, buf, sizeof(buf), 0);
- assert(0 <= rv && rv <= sizeof(buf));
- buf[sizeof(buf) - 1] = '\0';
-
- p = buf;
-
- val1 = xstrtoull(p, &p);
- assert(p[0] == '.');
- assert('0' <= p[1] && p[1] <= '9');
- assert('0' <= p[2] && p[2] <= '9');
- assert(p[3] == ' ');
-
- val2 = (p[1] - '0') * 10 + p[2] - '0';
- *uptime = val1 * 100 + val2;
-
- p += 4;
-
- val1 = xstrtoull(p, &p);
- assert(p[0] == '.');
- assert('0' <= p[1] && p[1] <= '9');
- assert('0' <= p[2] && p[2] <= '9');
- assert(p[3] == '\n');
-
- val2 = (p[1] - '0') * 10 + p[2] - '0';
- *idle = val1 * 100 + val2;
-
- assert(p + 4 == buf + rv);
-}
--
2.34.1
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