The patch titled
Subject: selftests: proc: add /proc/$(pid)/statm output validation
has been added to the -mm mm-nonmm-unstable branch. Its filename is
selftests-proc-add-proc-pid-statm-output-validation.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-proc-add-proc-pid-statm-output-validation.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Swarup Laxman Kotiaklapudi <swarupkotikalapudi@xxxxxxxxx>
Subject: selftests: proc: add /proc/$(pid)/statm output validation
Date: Wed, 4 Oct 2023 01:13:19 +0530
Add /proc/${pid}/statm validation
/proc/$(pid)/statm output is expected to be:
"0 0 0 * 0 0 0\n"
Here * can be any value
Read output of /proc/$(pid)/statm and check except for 4th position, all
other positions have value zero.
Link: https://lkml.kernel.org/r/20231003194319.602646-1-swarupkotikalapudi@xxxxxxxxx
Signed-off-by: Swarup Laxman Kotiaklapudi <swarupkotikalapudi@xxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/proc/proc-empty-vm.c | 57 +++++++++++++++--
1 file changed, 52 insertions(+), 5 deletions(-)
--- a/tools/testing/selftests/proc/proc-empty-vm.c~selftests-proc-add-proc-pid-statm-output-validation
+++ a/tools/testing/selftests/proc/proc-empty-vm.c
@@ -303,6 +303,56 @@ static int test_proc_pid_smaps_rollup(pi
}
}
+static int test_proc_pid_statm(pid_t pid)
+{
+ char buf[4096];
+ char *tok;
+ char *string;
+ int non_zero_value_indx = 4;
+ int i = 1;
+
+ snprintf(buf, sizeof(buf), "/proc/%u/statm", pid);
+
+ /*
+ * Output can be "0 0 0 2 0 0 0\n" where "2" can be anything.
+ */
+ int fd = open(buf, O_RDONLY);
+
+ if (fd == -1) {
+ if (errno == ENOENT) {
+ /*
+ * /proc/${pid}/statm is under CONFIG_PROC_PAGE_MONITOR,
+ * it doesn't necessarily exist.
+ */
+ return EXIT_SUCCESS;
+ }
+ perror("open /proc/${pid}/statm");
+ return EXIT_FAILURE;
+ } else {
+ ssize_t rv = read(fd, buf, sizeof(buf));
+
+ close(fd);
+ assert(rv);
+ string = buf;
+
+ while ((tok = strsep(&string, " ")) != NULL) {
+ if (i == non_zero_value_indx) {
+ if (!strncmp(tok, "0", 1))
+ goto err_statm;
+ } else {
+ if (strncmp(tok, "0", 1))
+ goto err_statm;
+ }
+ i++;
+ }
+ }
+
+ return EXIT_SUCCESS;
+
+err_statm:
+ assert(0);
+}
+
int main(void)
{
int rv = EXIT_SUCCESS;
@@ -389,11 +439,8 @@ int main(void)
if (rv == EXIT_SUCCESS) {
rv = test_proc_pid_smaps_rollup(pid);
}
- /*
- * TODO test /proc/${pid}/statm, task_statm()
- * ->start_code, ->end_code aren't updated by munmap().
- * Output can be "0 0 0 2 0 0 0\n" where "2" can be anything.
- */
+ if (rv == EXIT_SUCCESS)
+ rv = test_proc_pid_statm(pid);
/* Cut the rope. */
int wstatus;
_
Patches currently in -mm which might be from swarupkotikalapudi@xxxxxxxxx are
selftests-proc-add-proc-pid-statm-output-validation.patch
