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From d42f467a923dfc09309acb7a83b42e3285fbd8f4 Mon Sep 17 00:00:00 2001
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Message-Id: <d42f467a923dfc09309acb7a83b42e3285fbd8f4.1566225007.git.aquini@redhat.com>
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From: Sandipan Das <sandipan@linux.ibm.com>
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Date: Thu, 15 Aug 2019 13:08:28 +0530
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Subject: [RHEL7 PATCH 01/31] tests: Add utility to check for a minimum number
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of online cpus
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This adds a test utility to check if a minimum number (N)
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of online cpus are available. If available, this will also
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provide a list of the first N online cpus.
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Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
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Signed-off-by: Eric B Munson <emunson@mgebm.net>
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Signed-off-by: Rafael Aquini <aquini@redhat.com>
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---
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tests/hugetests.h | 1 +
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tests/testutils.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 49 insertions(+)
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diff --git a/tests/hugetests.h b/tests/hugetests.h
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index 8b1d8d9..e3179e6 100644
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--- a/tests/hugetests.h
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+++ b/tests/hugetests.h
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@@ -43,6 +43,7 @@ extern char *test_name;
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void check_free_huge_pages(int nr_pages_needed);
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void check_must_be_root(void);
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void check_hugetlb_shm_group(void);
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+void check_online_cpus(int[], int);
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void test_init(int argc, char *argv[]);
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int test_addr_huge(void *p);
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unsigned long long get_mapping_page_size(void *p);
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diff --git a/tests/testutils.c b/tests/testutils.c
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index 6298370..2b47547 100644
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--- a/tests/testutils.c
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+++ b/tests/testutils.c
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@@ -33,6 +33,8 @@
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <sys/stat.h>
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+#include <sys/sysinfo.h>
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+#include <sys/types.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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@@ -80,6 +82,52 @@ void check_hugetlb_shm_group(void)
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CONFIG("Do not have permission to use SHM_HUGETLB");
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}
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+#define SYSFS_CPU_ONLINE_FMT "/sys/devices/system/cpu/cpu%d/online"
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+
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+void check_online_cpus(int online_cpus[], int nr_cpus_needed)
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+{
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+ char cpu_state, path_buf[64];
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+ int total_cpus, cpu_idx, fd, ret, i;
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+
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+ total_cpus = get_nprocs_conf();
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+ cpu_idx = 0;
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+
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+ if (get_nprocs() < nr_cpus_needed)
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+ CONFIG("Atleast online %d cpus are required", nr_cpus_needed);
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+
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+ for (i = 0; i < total_cpus && cpu_idx < nr_cpus_needed; i++) {
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+ errno = 0;
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+ sprintf(path_buf, SYSFS_CPU_ONLINE_FMT, i);
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+ fd = open(path_buf, O_RDONLY);
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+ if (fd < 0) {
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+ /* If 'online' is absent, the cpu cannot be offlined */
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+ if (errno == ENOENT) {
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+ online_cpus[cpu_idx] = i;
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+ cpu_idx++;
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+ continue;
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+ } else {
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+ FAIL("Unable to open %s: %s", path_buf,
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+ strerror(errno));
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+ }
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+ }
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+
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+ ret = read(fd, &cpu_state, 1);
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+ if (ret < 1)
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+ FAIL("Unable to read %s: %s", path_buf,
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+ strerror(errno));
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+
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+ if (cpu_state == '1') {
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+ online_cpus[cpu_idx] = i;
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+ cpu_idx++;
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+ }
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+
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+ close(fd);
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+ }
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+
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+ if (cpu_idx < nr_cpus_needed)
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+ CONFIG("Atleast %d online cpus were not found", nr_cpus_needed);
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+}
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+
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void __attribute__((weak)) cleanup(void)
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{
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}
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--
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1.8.3.1
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