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Date: Tue, 7 Apr 2009 13:56:12 +0930
From: Rusty Russell <rusty@...tcorp.com.au>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Lai Jiangshan <laijs@...fujitsu.com>,
Vitaliy Gusev <vgusev@...nvz.org>,
Oleg Nesterov <oleg@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...e.hu>
Subject: [PULL] kthread and two misc cleanups (all long in linux-next)
The following changes since commit d508afb437daee7cf07da085b635c44a4ebf9b38:
Trond Myklebust (1):
NFS: Fix a double free in nfs_parse_mount_options()
are available in the git repository at:
ssh://master.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus.git master
Andrew Morton (1):
work_on_cpu(): rewrite it to create a kernel thread on demand
Lai Jiangshan (1):
cpuhotplug: remove cpu_hotplug_init()
Oleg Nesterov (1):
kthread: move sched-realeted initialization from kthreadd context
Rusty Russell (1):
misc: remove redundant start_kernel prototypes.
Vitaliy Gusev (1):
kthread: Don't looking for a task in create_kthread() #2
include/asm-frv/gdb-stub.h | 1 -
include/asm-mn10300/gdb-stub.h | 1 -
include/linux/cpu.h | 5 -----
init/main.c | 1 -
kernel/cpu.c | 11 +++--------
kernel/kthread.c | 26 ++++++++++++--------------
kernel/workqueue.c | 36 +++++++++++++++++++-----------------
7 files changed, 34 insertions(+), 47 deletions(-)
commit 2bb68fd7b6882ec39688d187ad89917ce734e9c8
Author: Rusty Russell <rusty@...tcorp.com.au>
Date: Tue Apr 7 13:51:33 2009 -0600
misc: remove redundant start_kernel prototypes.
No need for redeclaration.
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
include/asm-frv/gdb-stub.h | 1 -
include/asm-mn10300/gdb-stub.h | 1 -
2 files changed, 0 insertions(+), 2 deletions(-)
commit 49f3e4288e07854308caabe790e8491c2e64faf9
Author: Lai Jiangshan <laijs@...fujitsu.com>
Date: Tue Feb 17 17:08:40 2009 +0800
cpuhotplug: remove cpu_hotplug_init()
cpu_hotplug_init() is almost equal to a dummy function,
this patch remove it.
Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
include/linux/cpu.h | 5 -----
init/main.c | 1 -
kernel/cpu.c | 11 +++--------
3 files changed, 3 insertions(+), 14 deletions(-)
commit f52a0223e95a5f49f028f61902c86b12ad81df5d
Author: Vitaliy Gusev <vgusev@...nvz.org>
Date: Tue Apr 7 13:51:35 2009 -0600
kthread: Don't looking for a task in create_kthread() #2
Remove the unnecessary find_task_by_pid_ns(). kthread() can just
use "current" to get the same result.
Signed-off-by: Vitaliy Gusev <vgusev@...nvz.org>
Acked-by: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
kernel/kthread.c | 4 +---
1 files changed, 1 insertions(+), 3 deletions(-)
commit 5fc789815a655473119ccc8df8199ae39639db91
Author: Oleg Nesterov <oleg@...hat.com>
Date: Tue Apr 7 13:51:35 2009 -0600
kthread: move sched-realeted initialization from kthreadd context
kthreadd is the single thread which implements ths "create" request, move
sched_setscheduler/etc from create_kthread() to kthread_create() to
improve the scalability.
We should be careful with sched_setscheduler(), use _nochek helper.
Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Cc: Christoph Hellwig <hch@....de>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Pavel Emelyanov <xemul@...nvz.org>
Cc: Vitaliy Gusev <vgusev@...nvz.org
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
kernel/kthread.c | 22 +++++++++++-----------
1 files changed, 11 insertions(+), 11 deletions(-)
commit 188b4afa4bc94d7aaefac27fe37263df107f4c2d
Author: Andrew Morton <akpm@...ux-foundation.org>
Date: Tue Apr 7 13:51:35 2009 -0600
work_on_cpu(): rewrite it to create a kernel thread on demand
The various implemetnations and proposed implemetnations of work_on_cpu()
are vulnerable to various deadlocks because they all used queues of some
form.
Unrelated pieces of kernel code thus gained dependencies wherein if one
work_on_cpu() caller holds a lock which some other work_on_cpu() callback
also takes, the kernel could rarely deadlock.
Fix this by creating a short-lived kernel thread for each work_on_cpu()
invokation.
This is not terribly fast, but the only current caller of work_on_cpu() is
pci_call_probe().
It would be nice to find some other way of doing the node-local
allocations in the PCI probe code so that we can zap work_on_cpu()
altogether. The code there is rather nasty. I can't think of anything
simple at this time...
Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
kernel/workqueue.c | 36 +++++++++++++++++++-----------------
1 files changed, 19 insertions(+), 17 deletions(-)
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