* [patch 00/14] Syslets, generic asynchronous system call support, v2
@ 2007-02-15 16:51 Ingo Molnar
2007-02-15 17:59 ` Linus Torvalds
2007-02-18 10:31 ` Stephen Rothwell
0 siblings, 2 replies; 3+ messages in thread
From: Ingo Molnar @ 2007-02-15 16:51 UTC (permalink / raw)
To: linux-kernel
Cc: Linus Torvalds, Arjan van de Ven, Christoph Hellwig,
Andrew Morton, Alan Cox, Ulrich Drepper, Zach Brown,
Evgeniy Polyakov, David S. Miller, Suparna Bhattacharya,
Davide Libenzi, Thomas Gleixner
this is the v2 release of the syslet subsystem. This is an interim
release, not all known and pending items are fixed/changed yet - the
tree is still work in progress:
http://redhat.com/~mingo/syslet-patches/
The biggest conceptual change in v2 is the ability of cachemiss threads
to be turned into user threads. This fixes signal handling, makes them
ptrace-eable, etc. (I've updated the sample userspace code at the URL
above to also do user-space cachemiss processing - just Ctrl-Z the
async-test.c run to trigger it action.)
Things not yet done in v2 and planned for v3:
- multiple completion rings support
- share the 'spare thread' between multiple rings, to further reduce
startup costs.
- remove mlock() reliance
Changes since v1:
- FPU support fixed: detach FPU state from kernel thread state
(implemented by Arjan van de Ven)
- remove superfluous CLONE_VM from create_async_thread()
(noticed by Jens Axboe)
- sys_umem_add() does not ignore -EFAULT of __put_user()
(noticed by Andrew Morton)
- use VERIFY_READ instead of VERIFY_WRITE in copy_uatom()
(noticed by Andrew Morton)
- move schedule() to tail of loop in cachemiss_loop()
(noticed by Andrew Morton)
- added move_user_context() arch op
- added async_syscall() and recursion protection against re-entry of
sys_async_exec(), sys_fork()/sys_clone(), etc.
- added sys_async_thread() call - a user-space thread can thus call
back into the syslet subsystem and continue cachemiss work.
- further cleanups in the include files
- race fixes to sys_async_wait()
- optimized out the kmalloc()/kfree() of the async_head
- async_thread structure not on the kernel stack anymore, to allow
async contexts to run user-space.
- added support for head_stack and head_eip to enable the initial
thread/task to run a cachemiss user context too, if it gets turned
into a cachemiss thread.
As always, comments, suggestions, reports are welcome.
Ingo
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [patch 00/14] Syslets, generic asynchronous system call support, v2
2007-02-15 16:51 [patch 00/14] Syslets, generic asynchronous system call support, v2 Ingo Molnar
@ 2007-02-15 17:59 ` Linus Torvalds
2007-02-18 10:31 ` Stephen Rothwell
1 sibling, 0 replies; 3+ messages in thread
From: Linus Torvalds @ 2007-02-15 17:59 UTC (permalink / raw)
To: Ingo Molnar
Cc: linux-kernel, Arjan van de Ven, Christoph Hellwig, Andrew Morton,
Alan Cox, Ulrich Drepper, Zach Brown, Evgeniy Polyakov,
David S. Miller, Suparna Bhattacharya, Davide Libenzi,
Thomas Gleixner
On Thu, 15 Feb 2007, Ingo Molnar wrote:
>
> this is the v2 release of the syslet subsystem. This is an interim
> release, not all known and pending items are fixed/changed yet - the
> tree is still work in progress:
I'm still not a huge fan of the user space interface, but at least the
core code looks quite clean. No objections on that front.
Linus
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [patch 00/14] Syslets, generic asynchronous system call support, v2
2007-02-15 16:51 [patch 00/14] Syslets, generic asynchronous system call support, v2 Ingo Molnar
2007-02-15 17:59 ` Linus Torvalds
@ 2007-02-18 10:31 ` Stephen Rothwell
1 sibling, 0 replies; 3+ messages in thread
From: Stephen Rothwell @ 2007-02-18 10:31 UTC (permalink / raw)
To: Ingo Molnar
Cc: linux-kernel, Linus Torvalds, Arjan van de Ven,
Christoph Hellwig, Andrew Morton, Alan Cox, Ulrich Drepper,
Zach Brown, Evgeniy Polyakov, David S. Miller,
Suparna Bhattacharya, Davide Libenzi, Thomas Gleixner
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On Thu, 15 Feb 2007 17:51:51 +0100 Ingo Molnar <mingo@elte.hu> wrote:
>
>
> this is the v2 release of the syslet subsystem. This is an interim
> release, not all known and pending items are fixed/changed yet - the
> tree is still work in progress:
>
> http://redhat.com/~mingo/syslet-patches/
So, has anyone thought about all those 32bit processes running on a 64bit
kernel and how we are going to cope with this interface?
--
Cheers,
Stephen Rothwell sfr@canb.auug.org.au
http://www.canb.auug.org.au/~sfr/
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2007-02-15 16:51 [patch 00/14] Syslets, generic asynchronous system call support, v2 Ingo Molnar
2007-02-15 17:59 ` Linus Torvalds
2007-02-18 10:31 ` Stephen Rothwell
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