61 lines
2.2 KiB
Diff
61 lines
2.2 KiB
Diff
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From 90ec8ebe33ec72ed6d9f451de9443d67dd351d72 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Mon, 27 Feb 2023 19:02:41 +0100
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Subject: [PATCH] psi-util: fix error handling
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We checked ERRNO_IS_NOT_SUPPORTED on a possible positive non-error code,
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which isn't right.
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Fix that. Also add caching, since we are about to call this more often.
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Reference: https://github.com/systemd/systemd/pull/26610/commits/1ea90a9d409999159345ad8e193f7ef4cc7f634d
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Signed-off-by: zhaoxiaohu <zhaoxiaohu@kuaishou.com>
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Signed-off-by: yuwang <yuwang@kuaishou.com>
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---
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src/shared/psi-util.c | 23 ++++++++++++++---------
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1 file changed, 14 insertions(+), 9 deletions(-)
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diff --git a/src/shared/psi-util.c b/src/shared/psi-util.c
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index 009095e..9045ae2 100644
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--- a/src/shared/psi-util.c
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+++ b/src/shared/psi-util.c
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@@ -106,20 +106,25 @@ int read_resource_pressure(const char *path, PressureType type, ResourcePressure
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}
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int is_pressure_supported(void) {
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+ static thread_local int cached = -1;
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const char *p;
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+ int r;
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- /* The pressure files, both under /proc and in cgroups, will exist
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- * even if the kernel has PSI support disabled; we have to read
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- * the file to make sure it doesn't return -EOPNOTSUPP */
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- FOREACH_STRING(p, "/proc/pressure/cpu", "/proc/pressure/io", "/proc/pressure/memory") {
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- int r;
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+ /* The pressure files, both under /proc/ and in cgroups, will exist even if the kernel has PSI
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+ * support disabled; we have to read the file to make sure it doesn't return -EOPNOTSUPP */
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+ if (cached >= 0)
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+ return cached;
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+
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+ FOREACH_STRING(p, "/proc/pressure/cpu", "/proc/pressure/io", "/proc/pressure/memory") {
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r = read_virtual_file(p, 0, NULL, NULL);
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- if (r == -ENOENT || ERRNO_IS_NOT_SUPPORTED(r))
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- return 0;
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- if (r < 0)
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+ if (r < 0) {
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+ if (r == -ENOENT || ERRNO_IS_NOT_SUPPORTED(r))
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+ return (cached = false);
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+
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return r;
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+ }
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}
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- return 1;
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+ return (cached = true);
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}
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--
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2.33.0
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