linux-kernel - Re: [PATCH 21/26] tty: Convert tty

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Message-ID: <20140903131919.0d970b6f@alan.etchedpixels.co.uk>
Date:	Wed, 3 Sep 2014 13:19:19 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 21/26] tty: Convert tty_struct bitfield to bools

> Ahh. Thanks for the insight, Alan.
> 
> But set_bit() et. al. will generate an incredible amount of churn;
> what if I split the fields up to prevent false-sharing?

Do you feel lucky ;-)

I'd rather set_bit and friends were used. They exist largely for this
kind of reason and they also have atomic test/set methods which may in
the longer term be very useful.

Yes it is churn can't argue with that.

Alan
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