From: John Kacur <jkacur@redhat.com>
To: Paul Menage <menage@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
lkml <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
Clark Williams <williams@redhat.com>
Subject: Re: [PATCH 19/26] cgroups: Convert cgroups release_list_lock to raw_spinlock
Date: Mon, 11 Jan 2010 17:11:04 -0500 (EST) [thread overview]
Message-ID: <814830537.89691263247864845.JavaMail.root@zmail07.collab.prod.int.phx2.redhat.com> (raw)
In-Reply-To: <6599ad831001111350l4e125bcdo4b5cf278d18e46ac@mail.gmail.com>
----- "Paul Menage" <menage@google.com> wrote:
> Does this patch take the lock out of the scope of lockdep? Or is
> raw_spinlock still high-level enough to support lockdep?
lockdep should work as before - in fact everything should work as before.
This is pretty much a no-op until preempt-rt changes are pushed upstream.
>
> Paul
>
> On Mon, Jan 11, 2010 at 1:26 PM, John Kacur <jkacur@redhat.com>
> wrote:
> > Convert locks which cannot sleep in preempt-rt to raw_spinlocks
> >
> > See also 58814bae5de64d5291b813ea0a52192e4fa714ad
> >
> > Signed-off-by: John Kacur <jkacur@redhat.com>
> > ---
> > kernel/cgroup.c | 18 +++++++++---------
> > 1 files changed, 9 insertions(+), 9 deletions(-)
> >
> > diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> > index 0249f4b..32a80b2 100644
> > --- a/kernel/cgroup.c
> > +++ b/kernel/cgroup.c
> > @@ -204,7 +204,7 @@ list_for_each_entry(_root, &roots, root_list)
> > /* the list of cgroups eligible for automatic release. Protected
> by
> > * release_list_lock */
> > static LIST_HEAD(release_list);
> > -static DEFINE_SPINLOCK(release_list_lock);
> > +static DEFINE_RAW_SPINLOCK(release_list_lock);
> > static void cgroup_release_agent(struct work_struct *work);
> > static DECLARE_WORK(release_agent_work, cgroup_release_agent);
> > static void check_for_release(struct cgroup *cgrp);
> > @@ -3151,11 +3151,11 @@ again:
> > finish_wait(&cgroup_rmdir_waitq, &wait);
> > clear_bit(CGRP_WAIT_ON_RMDIR, &cgrp->flags);
> >
> > - spin_lock(&release_list_lock);
> > + raw_spin_lock(&release_list_lock);
> > set_bit(CGRP_REMOVED, &cgrp->flags);
> > if (!list_empty(&cgrp->release_list))
> > list_del(&cgrp->release_list);
> > - spin_unlock(&release_list_lock);
> > + raw_spin_unlock(&release_list_lock);
> >
> > cgroup_lock_hierarchy(cgrp->root);
> > /* delete this cgroup from parent->children */
> > @@ -3691,13 +3691,13 @@ static void check_for_release(struct cgroup
> *cgrp)
> > * already queued for a userspace notification,
> queue
> > * it now */
> > int need_schedule_work = 0;
> > - spin_lock(&release_list_lock);
> > + raw_spin_lock(&release_list_lock);
> > if (!cgroup_is_removed(cgrp) &&
> > list_empty(&cgrp->release_list)) {
> > list_add(&cgrp->release_list,
> &release_list);
> > need_schedule_work = 1;
> > }
> > - spin_unlock(&release_list_lock);
> > + raw_spin_unlock(&release_list_lock);
> > if (need_schedule_work)
> > schedule_work(&release_agent_work);
> > }
> > @@ -3747,7 +3747,7 @@ static void cgroup_release_agent(struct
> work_struct *work)
> > {
> > BUG_ON(work != &release_agent_work);
> > mutex_lock(&cgroup_mutex);
> > - spin_lock(&release_list_lock);
> > + raw_spin_lock(&release_list_lock);
> > while (!list_empty(&release_list)) {
> > char *argv[3], *envp[3];
> > int i;
> > @@ -3756,7 +3756,7 @@ static void cgroup_release_agent(struct
> work_struct *work)
> > struct cgroup,
> > release_list);
> > list_del_init(&cgrp->release_list);
> > - spin_unlock(&release_list_lock);
> > + raw_spin_unlock(&release_list_lock);
> > pathbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
> > if (!pathbuf)
> > goto continue_free;
> > @@ -3786,9 +3786,9 @@ static void cgroup_release_agent(struct
> work_struct *work)
> > continue_free:
> > kfree(pathbuf);
> > kfree(agentbuf);
> > - spin_lock(&release_list_lock);
> > + raw_spin_lock(&release_list_lock);
> > }
> > - spin_unlock(&release_list_lock);
> > + raw_spin_unlock(&release_list_lock);
> > mutex_unlock(&cgroup_mutex);
> > }
> >
> > --
> > 1.6.5.2
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe
> linux-kernel" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at http://www.tux.org/lkml/
> >
next prev parent reply other threads:[~2010-01-11 22:11 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-11 21:26 [PATCH 00/26] Convert locks that can't sleep in -rt to raw_spinlock John Kacur
2010-01-11 21:26 ` [PATCH 01/26] xtime_lock: Convert atomic_seqlock to raw_seqlock, fix up all users John Kacur
2010-01-11 21:26 ` [PATCH 02/26] seqlock: Create raw_seqlock John Kacur
2010-01-11 21:26 ` [PATCH 03/26] x86: Convert tlbstate_lock to raw_spinlock John Kacur
2010-01-11 21:26 ` [PATCH 04/26] sched: Convert thread_group_cputimer lock " John Kacur
2010-01-11 21:26 ` [PATCH 05/26] x86: Convert ioapic_lock and vector_lock to raw_spinlocks John Kacur
2010-01-11 21:26 ` [PATCH 06/26] x86: Convert i8259A_lock to raw_spinlock John Kacur
2010-01-11 21:26 ` [PATCH 07/26] x86: Convert pci_config_lock " John Kacur
2010-01-11 21:26 ` [PATCH 08/26] i8253: Convert i8253_lock " John Kacur
2010-01-11 21:26 ` [PATCH 09/26] x86: Convert set_atomicity_lock " John Kacur
2010-01-11 21:26 ` [PATCH 10/26] ACPI: Convert c3_lock " John Kacur
2010-01-11 21:26 ` [PATCH 11/26] rtmutex: Convert wait_lock and pi_lock " John Kacur
2010-01-11 21:26 ` [PATCH 12/26] printk: Convert lock " John Kacur
2010-01-11 21:26 ` [PATCH 13/26] genirq: Convert locks to raw_spinlocks John Kacur
2010-01-11 21:26 ` [PATCH 14/26] trace: Convert various locks to raw_spinlock John Kacur
2010-01-11 21:26 ` [PATCH 15/26] clocksource: Convert watchdog_lock " John Kacur
2010-01-11 21:26 ` [PATCH 16/26] timer_stats: Convert to raw_spinlocks John Kacur
2010-01-11 21:26 ` [PATCH 17/26] x86: kvm: Convert i8254/i8259 locks to raw_spinlock John Kacur
2010-01-11 21:26 ` [PATCH 18/26] x86 - nmi: Convert nmi_lock " John Kacur
2010-01-11 21:26 ` [PATCH 19/26] cgroups: Convert cgroups release_list_lock " John Kacur
2010-01-11 21:26 ` [PATCH 20/26] proportions: Convert spinlocks to raw_spinlocks John Kacur
2010-01-11 21:26 ` [PATCH 21/26] percpu_counter: Convert to raw_spinlock John Kacur
2010-01-11 21:26 ` [PATCH 22/26] oprofile: " John Kacur
2010-01-11 21:26 ` [PATCH 23/26] vgacon: Convert vga console lock " John Kacur
2010-01-11 21:26 ` [PATCH 24/26] pci-access: Convert pci_lock " John Kacur
2010-01-11 21:26 ` [PATCH 25/26] kprobes: Convert to raw_spinlocks John Kacur
2010-01-11 21:26 ` [PATCH 26/26] softlockup: " John Kacur
2010-01-12 3:54 ` [PATCH 25/26] kprobes: " Frederic Weisbecker
2010-01-11 21:50 ` [PATCH 19/26] cgroups: Convert cgroups release_list_lock to raw_spinlock Paul Menage
2010-01-11 22:11 ` John Kacur [this message]
2010-01-12 3:39 ` [PATCH 14/26] trace: Convert various locks " Frederic Weisbecker
2010-01-13 15:28 ` Steven Rostedt
2010-01-13 15:36 ` John Kacur
2010-01-13 15:41 ` Steven Rostedt
2010-01-13 18:09 ` John Kacur
2010-01-17 13:00 ` Frederic Weisbecker
2010-01-12 3:24 ` [PATCH 00/26] Convert locks that can't sleep in -rt " Frederic Weisbecker
2010-01-12 3:49 ` Frederic Weisbecker
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