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infra: make msleep_backoff() interruptible

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Thomas Schoebel-Theuer 2023-01-18 18:41:14 +01:00
parent 3c77a0fdf6
commit e380aea93f
1 changed files with 24 additions and 1 deletions
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25
kernel/brick_mem.c
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@ -120,9 +120,32 @@ void get_total_ram(void)
BRICK_INF("total RAM = %lld [KiB]\n", brick_global_memavail);
}
/* Use the safe msleep_interruptible() from the upstream kernel.
* In addition to a linear backoff algorithms for dynamic
* CPU giveup, we allow negative arguments at the very first start
* of a polling-like cycle, more similar to cond_resched() behaviour.
*
* This is very useful in OOM-like situations, in order to allow
* other parts of the system to recover their operations.
* CAVEAT: the sleeps are rather long, so please use this only
* in desperate situations (when other measures have failed).
*/
void msleep_backoff(int *ms)
{
msleep(*ms);
if (*ms < 0) {
*ms = 0;
return;
}
flush_signals(current);
msleep_interruptible(*ms);
/* Normally, we add only 1 jiffie per round, speculating
* that this will catch practically all usual cases in
* contemporary hardware stuff.
* Only when this speculation has proven wrong, we
* accelerate the linear slope somewhat.
*/
if (*ms < 100)
*ms += 1000 / HZ;
else if (*ms < 1000)