Re: ll_rw_blk.c fails to merge requests. Help!

From: Jens Axboe (
Date: Thu Aug 24 2000 - 17:03:15 EST

On Thu, Aug 24 2000, Linus Torvalds wrote:
> > Heh, but it's not that simple. The requests that are currently on
> > the pending list, are not necessarily added to the same freelist. So
> > we have to scan the pending list, and look at each request individually.
> Why not just have a pending list for each free list, no?

Okay, here's a new version. The pending list always contains requests
from the write list, so we can use list_splice. We batch a quarter
the size freelist, i.e. half the size of the write list -- whether
that is a good number, I don't know. I suspect it should be less
than that.

* Jens Axboe <>
* SuSE Labs

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