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authorJuri Lelli <juri.lelli@gmail.com>2017-12-12 12:10:24 +0100
committerIngo Molnar <mingo@kernel.org>2018-01-10 11:30:31 +0100
commit34be39305a77b8b1ec9f279163c7cdb6cc719b91 (patch)
tree1d970e5d92e508630d575814a3bae1181ed85348 /kernel/time
parent7332dec055f2457c386032f7e9b2991eb05c2a0a (diff)
sched/deadline: Implement "runtime overrun signal" support
This patch adds the possibility of getting the delivery of a SIGXCPU signal whenever there is a runtime overrun. The request is done through the sched_flags field within the sched_attr structure. Forward port of https://lkml.org/lkml/2009/10/16/170 Tested-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Juri Lelli <juri.lelli@gmail.com> Signed-off-by: Claudio Scordino <claudio@evidence.eu.com> Signed-off-by: Luca Abeni <luca.abeni@santannapisa.it> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tommaso Cucinotta <tommaso.cucinotta@sssup.it> Link: http://lkml.kernel.org/r/1513077024-25461-1-git-send-email-claudio@evidence.eu.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/posix-cpu-timers.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 1f27887aa194..cf50ea34dbd1 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -14,6 +14,7 @@
#include <linux/tick.h>
#include <linux/workqueue.h>
#include <linux/compat.h>
+#include <linux/sched/deadline.h>
#include "posix-timers.h"
@@ -791,6 +792,14 @@ check_timers_list(struct list_head *timers,
return 0;
}
+static inline void check_dl_overrun(struct task_struct *tsk)
+{
+ if (tsk->dl.dl_overrun) {
+ tsk->dl.dl_overrun = 0;
+ __group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk);
+ }
+}
+
/*
* Check for any per-thread CPU timers that have fired and move them off
* the tsk->cpu_timers[N] list onto the firing list. Here we update the
@@ -804,6 +813,9 @@ static void check_thread_timers(struct task_struct *tsk,
u64 expires;
unsigned long soft;
+ if (dl_task(tsk))
+ check_dl_overrun(tsk);
+
/*
* If cputime_expires is zero, then there are no active
* per thread CPU timers.
@@ -906,6 +918,9 @@ static void check_process_timers(struct task_struct *tsk,
struct task_cputime cputime;
unsigned long soft;
+ if (dl_task(tsk))
+ check_dl_overrun(tsk);
+
/*
* If cputimer is not running, then there are no active
* process wide timers (POSIX 1.b, itimers, RLIMIT_CPU).
@@ -1111,6 +1126,9 @@ static inline int fastpath_timer_check(struct task_struct *tsk)
return 1;
}
+ if (dl_task(tsk) && tsk->dl.dl_overrun)
+ return 1;
+
return 0;
}