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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

  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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