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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2018-11-05 15:41:14 +0100 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2019-03-06 15:12:10 +0100 |
| commit | 5fa62195f542a9f3ed4a824c4c11996b8b64ece0 (patch) | |
| tree | bb3b9941fd6e1c29b6325385d3c749d580d6a01a | |
| parent | c3eba6648e4572799c0385b2c29699c2bba5e51e (diff) | |
| download | man-pages-5fa62195f542a9f3ed4a824c4c11996b8b64ece0.tar.gz | |
sched_setattr.2: Note that SCHED_FLAG_DL_OVERRUN SIGXCPU signal is process-directed
And further note that this is probably a bug.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man2/sched_setattr.2 | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/man2/sched_setattr.2 b/man2/sched_setattr.2 index 235d575205..806ab67c86 100644 --- a/man2/sched_setattr.2 +++ b/man2/sched_setattr.2 @@ -172,14 +172,29 @@ thread to reclaim bandwidth unused by other real-time thread. .TP .BR SCHED_FLAG_DL_OVERRUN " (since Linux 4.16)" .\" commit 34be39305a77b8b1ec9f279163c7cdb6cc719b91 -This flag allows a +This flag allows an application to get informed about run-time overruns in .BR SCHED_DEADLINE -thread to get informed about run-time overruns, -which may be caused by (for example) coarse execution time accounting +threads. +Such overruns may be caused by (for example) coarse execution time accounting or incorrect parameter assignment. Notification takes the form of a .B SIGXCPU signal which is generated on each overrun. +.IP +This +.BR SIGXCPU +signal is +.I process-directed +(see +.BR signal (7)) +rather than thread-directed. +This is probably a bug. +On the one hand, +.BR sched_setattr () +is being used to set a per-thread attribute. +On the other hand, if the process-directed signal is delivered to +a thread inside the process other than the one that had a run-time overrun, +the application has no way of knowing which thread overran. .RE .TP .I sched_nice |