lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Tue, 25 Dec 2007 14:05:26 -0800
From:	Andrew Morton <>
To:	Christoph Hellwig <>
Cc:	Jan Beulich <>,,,,,
Subject: Re: [PATCH 0/4] add task handling notifier

On Sun, 23 Dec 2007 12:26:21 +0000 Christoph Hellwig <> 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 ( 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:
> 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

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

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists