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Remove a printf and add a comment on an assumption that could be

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occasionally violated by device drivers.
This commit is contained in:
Luigi Rizzo 2002-06-27 23:23:04 +00:00
parent 2bf844deae
commit d26d355f0e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=98946
1 changed files with 10 additions and 3 deletions
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13
sys/kern/kern_poll.c
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@ -195,6 +195,12 @@ init_device_poll(void)
/*
* Hook from hardclock. Tries to schedule a netisr, but keeps track
* of lost ticks due to the previous handler taking too long.
* Normally, this should not happen, because polling handler should
* run for a short time. However, in some cases (e.g. when there are
* changes in link status etc.) the drivers take a very long time
* (even in the order of milliseconds) to reset and reconfigure the
* device, causing apparent lost polls.
*
* The first part of the code is just for debugging purposes, and tries
* to count how often hardclock ticks are shorter than they should,
* meaning either stray interrupts or delayed events.
@ -217,10 +223,11 @@ hardclock_device_poll(void)
prev_t = t;
if (pending_polls > 100) {
/* too much, assume it has stalled */
/*
* Too much, assume it has stalled (not always true
* see comment above).
*/
stalled++;
printf("poll stalled [%d] in phase %d\n",
stalled, phase);
pending_polls = 0;
phase = 0;
}