From: Bart Van Assche <bvanassche@acm.org>
To: dsterba@suse.cz, Yunfeng Ye <yeyunfeng@huawei.com>,
bhelgaas@google.com, "tglx@linutronix.de" <tglx@linutronix.de>,
Alexander Duyck <alexander.h.duyck@linux.intel.com>,
sakari.ailus@linux.intel.com,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
David Sterba <dsterba@suse.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] async: Let kfree() out of the critical area of the lock
Date: Thu, 26 Sep 2019 08:18:38 -0700 [thread overview]
Message-ID: <e339db78-413c-446a-8e07-40e6e1ad4a31@acm.org> (raw)
In-Reply-To: <20190926110648.GM2751@suse.cz>
On 9/26/19 4:06 AM, David Sterba wrote:
> On Thu, Sep 26, 2019 at 03:58:36PM +0800, Yunfeng Ye wrote:
>> The async_lock is big global lock, I think it's good to put kfree() outside
>> to keep the critical area as short as possible.
>
> Agreed, kfree is not always cheap. We had patches in btrfs moving kfree
> out of critical section(s) after causing softlockups due to increased lock
> contention.
The above would be a great addition for the commit description. Anyway:
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
next prev parent reply other threads:[~2019-09-26 15:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-25 12:52 [PATCH] async: Let kfree() out of the critical area of the lock Yunfeng Ye
2019-09-25 13:38 ` gregkh
2019-09-25 13:45 ` Yunfeng Ye
2019-09-25 15:20 ` Alexander Duyck
2019-09-26 7:58 ` Yunfeng Ye
2019-09-26 11:06 ` David Sterba
2019-09-26 15:18 ` Bart Van Assche [this message]
2019-09-27 1:00 ` Yunfeng Ye
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