John Baldwin wrote:
On Sunday 18 December 2005 06:28 am, Nate Lawson wrote:
Scott Long wrote:
Nate Lawson wrote:
njl 2005-12-17 03:57:10 UTC
FreeBSD src repository
Modified files:
sys/sys ktr.h
sys/kern kern_clock.c kern_switch.c
Log:
Clean up unused or poorly utilized KTR values. Remove KTR_FS,
KTR_KGDB, and KTR_IO as they were never used. Remove KTR_CLK since it
was only used for hardclock firing and use KTR_INTR there instead.
Remove KTR_CRITICAL since it was only used for crit enter/exit and use
KTR_CONTENTION instead.
Revision Changes Path
1.183 +1 -1 src/sys/kern/kern_clock.c
1.118 +2 -2 src/sys/kern/kern_switch.c
1.35 +12 -12 src/sys/sys/ktr.h
Um, I was using KTR_CRITICAL for schedgraph. It was actually quite
useful. Compressing the option space only makes the options less
useful. Surely there has to be a better solution. Or, at least you
could call for comments before you alter this stuff.
You didn't speak up about that in the previous discussion on arch@,
starting 10/31/2005. The only comment was jhb@ saying it was not useful
alone, and he's the only one doing work on critical sections lately.
I didn't say to merge it to KTR_CONTENTION, I said to make it use KTR_SUBSYS
but have it optional (I just checked the thread, and in my first e-mail I
remembered incorrectly) (i.e. put a #if 0 #define KTR_CRITICAL KTR_CONTENTION
#else #define KTR_CRITICAL 0 #endif in kern_switch.c). Given Scott's recent
changes to schedgraph, it would probably be best to just make then under
KTR_SCHED, though maybe have it optional, thus:
#if 0
#define KTR_CRITICAL KTR_SCHED
#else
#define KTR_CRITICAL 0
#endif
or something.
Ok, I committed this.
If you can think of another use for this besides one event (enter/exit),
feel free to add it back. Or, consider adding KTR_SUBSYS as a one-off
use like KTR_DEV is for other parts of the system. KTR_CRITICAL would
be conditionally defined as KTR_SUBSYS when needed.
That's what I asked you to do and you ignored that part of what I said. :( It
can be ok to have a KTR class limited to a small number of events if those
events fire very often which these do. I think you can also make KTR_WITNESS
optional and use KTR_SUBSYS as well. (That's also in my original replies.)
And I'd still be interested in feedback on my proposal to axe the whole
bitmask concept for KTR entirely.
I didn't want to add KTR_SUBSYS or touch KTR_WITNESS when I wasn't sure
of all the ramifications. I've got enough free bits now; feel free to
continue this if you want.
--
Nate
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