On Wed, 27 Jun 2001, Chris Mason wrote:
> On Wednesday, June 27, 2001 04:43:28 PM -0300 Rik van Riel
> > If you don't have free memory, you are limited to 2 choices:
> >
> > 1) wait on IO
> > 2) spin endlessly, wasting CPU until the IO is done
>
> Ok, I need to describe the problem a little better. reiserfs
> inodes need to be logged, which means you have to join/start a
> transaction in order to write them.
> So, the only time reiserfs_write_inode needs to do something is for fsync
> and/or O_SYNC writes, and all it needs to do is commit the transaction.
>
> Any time kswapd is calling write_inode, it is just trying to
> free the inode struct, and reiserfs can safely ignore the write
> request, regardless of if a sync is requested.
OK, sounds sane enough to me ;)
So the fix is just to let reiserfs_write_inode always be
asynchronous, independent of its arguments, as long as
we're not in fsync() or O_SYNC.
OTOH, if we are called synchronously, we could also just
walk down the code path taken when we _are_ called by
fsync(), right ?
regards,
Rik
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This archive was generated by hypermail 2b29 : Sat Jun 30 2001 - 21:00:17 EST