"Steven N. Hirsch" wrote:
>
> On Tue, 6 Nov 2001, Andrew Morton wrote:
>
> > Download details and documentation are at
> >
> > http://www.uow.edu.au/~andrewm/linux/ext3/
> >
> > Changes since ext3-0.9.13 (which was against linux-2.4.13):
> >
> > - For a long time, the ext3 patch has used a semaphore in the core
> > kernel to prevent concurrent pagein and truncate of the same
> > file. This was to prevent a race wherein the paging-in task
> > would wake up after the truncate and would instantiate a page
> > in the process's page tables which had attached buffers. This
> > leads to a BUG() if the swapout code tries to swap the page out.
> >
> > This semaphore has been removed. The swapout code has been altered
> > to simply detect and ignore these pages.
> >
> > This is an incredibly obscure and hard-to-hit situation. The testcase
> > which used to trigger it can no longer do so. So if anyone sees the
> > message "try_to_swap_out: page has buffers!", please shout out.
>
> Andrew,
>
> I have been getting thousands of these when the system was under heavy
> load, but didn't realize it was from the ext3 code! I'm using Linus's
> 2.4.14-pre7 + ext3 patch from Neil Brown's site (the latter is identified
> as "ZeroNineFourteen".) Would you like me to upgrade kernel and patch?
>
Now that's interesting. The printk is in there so I can ensure
that the codepath gets tested and is known to work.
Could you please send me details of the hardware setup, URL
for Neil's patch and a description of the workload? Whatever
I need to make it happen locally.
If the message bothers you, please just remove the printk from
vmscan.c.
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This archive was generated by hypermail 2b29 : Wed Nov 07 2001 - 21:00:31 EST