lkml.org 
[lkml]   [2007]   [Apr]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: rsdl:mouse freezing while doing git-gc
On 12/04/07, surya.prabhakar@wipro.com <surya.prabhakar@wipro.com> wrote:
> > [...]
> >
> > btw, it's sd-0.39, isn't?
> No! it is not. I have updated it to 2.6.21-rc5-sd-0.39.patch and
> did the same tests.

It's nice-dependent. At least, that's something one would expect from
this design..

> PRI values s constantly changing while the git-gc is running. Is this
> expected behaviour?

Yep. Each nice level has a set of dynamic priorities which can be be
used by a task. After exhausting a time quota on a current level, the
task is moved to another (if there are no more -> "expired" array). So
the "PRI" field shows the current dynamic level.
The exceptions are SCHED_BATCH and Real-Time (FIFO and RR) tasks which
have different priority scheme.

/*
* This contains a bitmap for each dynamic priority level with empty slots
* for the valid priorities each different nice level can have. It allows
* us to stagger the slots where differing priorities run in a way that
* keeps latency differences between different nice levels at a minimum.
* ie, where 0 means a slot for that priority, priority running from left to
* right:
* nice -20 0000000000000000000000000000000000000000
* nice -10 1001000100100010001001000100010010001000
* nice 0 0101010101010101010101010101010101010101
* nice 5 1101011010110101101011010110101101011011
* nice 10 0110111011011101110110111011101101110111
* nice 15 0111110111111011111101111101111110111111
* nice 19 1111111111111111111011111111111111111111

As you can see there is only a single possible level for nice 19
tasks, that's why your first results looked strange _but_ it might
have been due to the old version which lacks the prio_matrix (or it
was broken.. PRI == 0 for NICE 19 is very strabge indeed). So it's
good you have upgraded to the recent one.

I have made a small debugging extension that allows to monitor all the
priority levels (and how many times) being used by a given task
(configured via proc).. will test it later (don't have sd-enabled
kernel here). Just want to be sure that the "rules" are never broken.
Most likely Con did it already but as he is off-line we can't know.

>
> Did another test with hackbench and git-gc both at same priorities
> and captured the top output, in here all of them seem to have
> same priority..

Yep, this one looks good.


> thanks.
>
> surya.

--
Best regards,
Dmitry Adamushko
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-04-12 14:13    [W:0.147 / U:0.072 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site