john stultz wrote:
On Mon, 2005-12-12 at 19:31 +0000, Shailabh Nagar wrote:
Christoph Lameter wrote:
On Wed, 7 Dec 2005, Shailabh Nagar wrote:
+void getnstimestamp(struct timespec *ts)
There is already getnstimeofday in the kernel.
Yes, and that function is being used within the getnstimestamp() being proposed.
However, John Stultz had advised that getnstimeofday could get affected by
calls to
settimeofday and had recommended adjusting the getnstimeofday value with
wall_to_monotonic.
John, could you elaborate ?
I think you pretty well have it covered.
getnstimeofday + wall_to_monotonic should be higher-res and more
reliable (then TSC based sched_clock(), for example) for getting a
timestamp.
How is this proposed function different from
do_posix_clock_monotonic_gettime()?
It calls getnstimeofday(), it also adjusts with wall_to_monotinic.
It seems to me we just need to EXPORT_SYMBOL_GPL the
do_posix_clock_monotonic_gettime()?
Thanks,
- jay
There may be performance concerns as you have to access the clock
hardware in getnstimeofday(), but there really is no other way for
reliable finely grained monotonically increasing timestamps.
thanks
-john
-------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc. Do you grep through log files
for problems? Stop! Download the new AJAX search engine that makes
searching your log files as easy as surfing the web. DOWNLOAD SPLUNK!
http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click
_______________________________________________
ckrm-tech mailing list
https://lists.sourceforge.net/lists/listinfo/ckrm-tech
