On Sun, 23 Dec 2007 12:26:21 +0000 Christoph Hellwig <[email protected]> wrote:
> On Thu, Dec 20, 2007 at 01:11:24PM +0000, Jan Beulich wrote:
> > With more and more sub-systems/sub-components leaving their footprint
> > in task handling functions, it seems reasonable to add notifiers that
> > these components can use instead of having them all patch themselves
> > directly into core files.
>
> I agree that we probably want something like this. As do some others,
> so we already had a few a few attempts at similar things. The first one
> is from SGI and called PAGG (http://oss.sgi.com/projects/pagg/) and also
> includes allocating per-task data for it's users. Then also from SGI
> there has been a simplified version called pnotify that's also available
> from the website above.
>
> Later Matt Helsley had something called "Task Watchers" which lwn has
> an article on: http://lwn.net/Articles/208117/.
>
> For some reason neither ever made a lot of progess (performance
> problems?).
>
I had it in -mm, sorted out all the problems but ended up not pulling the
trigger.
Problem is, it adds runtime overhead purely for the convenience of kernel
programmers, and I don't think that's a good tradeoff.
Sprinkling direct calls into a few well-known sites won't kill us, and
we've survived this long. Why not keep doing that, and save everyone a few
cycles?
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