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rump: prevent sleep times of less than 1 sec

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This patch caps the busyness of the rump kernel, which normally calls
sleep with timeouts between 0 and 10 ms even when idle. On Sculpt
running on a x250 laptop, this patch saves 0.4% CPU load, which is
almost the half of the idle load.

Issue #5140
This commit is contained in:
Norman Feske 2024-03-11 14:32:12 +01:00 committed by Christian Helmuth
parent bc0b6be6a9
commit 6407f8667f
1 changed files with 12 additions and 0 deletions
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12
repos/dde_rump/src/lib/rump/hypercall.cc
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@ -324,6 +324,18 @@ int rumpuser_clock_sleep(int enum_rumpclock, int64_t sec, long nsec)
break;
}
/*
* When using rump in the form of vfs_rump as file-system implementation,
* this function is steadily called with sleep times in the range of 0 to
* 10 ms, inducing load even when the file system is not accessed.
*
* This load on idle can be lowered by forcing a sleep time of at least one
* second. This does not harm the operation of vfs_rump because the file
* system is not driven by time.
*/
if (msec < 1000)
msec = 1000;
Rump::env().sleep_sem().down(true, Genode::Microseconds(msec * 1000));
rumpkern_sched(nlocks, 0);