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psi: update is_pressure_supported to read file

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The kernel still provides the /proc and cgroup pressure files even
if its psi support is disabled, so we need to actually read the files
to verify they don't return -EOPNOTSUPP
This commit is contained in:
Dan Streetman
2021-05-19 14:22:28 -04:00
parent 264f0afe0d
commit 0de2fd1870
1 changed files with 13 additions and 6 deletions
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19
src/shared/psi-util.c
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@@ -4,6 +4,7 @@
#include <unistd.h>
#include "alloc-util.h"
#include "errno-util.h"
#include "extract-word.h"
#include "fd-util.h"
#include "fileio.h"
@@ -107,12 +108,18 @@ int read_resource_pressure(const char *path, PressureType type, ResourcePressure
int is_pressure_supported(void) {
const char *p;
FOREACH_STRING(p, "/proc/pressure/cpu", "/proc/pressure/io", "/proc/pressure/memory")
if (access(p, F_OK) < 0) {
if (errno == ENOENT)
return 0;
return -errno;
}
/* The pressure files, both under /proc and in cgroups, will exist
* even if the kernel has PSI support disabled; we have to read
* the file to make sure it doesn't return -EOPNOTSUPP */
FOREACH_STRING(p, "/proc/pressure/cpu", "/proc/pressure/io", "/proc/pressure/memory") {
int r;
r = read_virtual_file(p, 0, NULL, NULL);
if (r == -ENOENT || ERRNO_IS_NOT_SUPPORTED(r))
return 0;
if (r < 0)
return r;
}
return 1;
}