Re: 2.4.20: Proccess stuck in __lock_page ...

[manish (manish@storadinc.com)]

Marcelo Tosatti wrote:

> On Tue, 27 May 2003, Marc-Christian Petersen wrote:
>
> > On Tuesday 27 May 2003 19:47, Marcelo Tosatti wrote:
> >
> > Hi Marcelo,
> >
> > > > A pause is _not_ perfectly fine, even not to some extent. That pause we
> > > > are discussing about is a pause of the _whole_ machine, not just disk i/o
> > > > pauses. Mouse stops, keyboard stops, everything stops, who knows wtf.
> > > Do you also notice them?
> > I do, people I know do also, numbers of those people only _I_ know are about
> > ~30. I've reported this problem over a year ago while 2.4.19-pre time.
>
> Can you please try to reproduce it with -aa?
>
> > > > That behaviour is absolutely bullshit for desktop users. For serverusage
> > > > you may not notice it in this dimension (mostly no X so no mouse), but
> > > > also for a server environment this may be very bad.
> > > Agreed.
Hello !

After several tests, I have noticed that I can produce this problem 
easily when my bdflush settings are:

30   50      32      100     50      300   60       0       0

and it occurs very less frequently when my settings are:

2       50      32      100     50      300     1       0       0


Right now, I noticed the following stack trace for one such stuck process:

sys_read
generic_file_read
do_generic_file_read
page_cache_read
__alloc_pages
balance_classzone
try_to_free_pages
shrink_caches
shrink_cache
try_to_release_page
try_to_free_buffer
sync_page_buffers
wait_on_buffer
__wait_on_buffer
schedule

Thanks
-Manish









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