From: Ira Weiny <ira.weiny@intel.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org
Subject: Re: kmap_local semantics
Date: Fri, 12 Mar 2021 07:36:46 -0800 [thread overview]
Message-ID: <20210312153646.GE3014244@iweiny-DESK2.sc.intel.com> (raw)
In-Reply-To: <20210312065413.GA29805@lst.de>
On Fri, Mar 12, 2021 at 07:54:13AM +0100, Christoph Hellwig wrote:
> So with the new kmap_local interface is it possible / advisable to
> use local kmaps over code that might schedule(), e.g. to wait for I/O?
It is possible yes. "Advisable" I think so. Thomas knows better than I what
performance would be.
FWIW I have been working on converting kmaps to kmap_local. Most of the
instances don't schedule AFAICT.
What I really don't want to see is any kmap'ings handed to another thread. I
am working hard to eliminate the use of kmap for that use. Is that going to be
a problem?
Ira
next prev parent reply other threads:[~2021-03-12 15:37 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-12 6:54 kmap_local semantics Christoph Hellwig
2021-03-12 15:36 ` Ira Weiny [this message]
2021-03-17 13:59 ` Thomas Gleixner
2021-03-18 2:44 ` Ira Weiny
2021-03-18 4:36 ` Christoph Hellwig
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