Re: Convert P_COWINPROGRESS to per-thread lock-less flag..

From: Kirk McKusick (mckusick_at_beastie.mckusick.com)
Date: 10/23/03

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    To: John Baldwin <jhb@FreeBSD.org>
Date: Thu, 23 Oct 2003 13:05:57 -0700

            Date: Thu, 23 Oct 2003 14:30:15 -0400 (EDT)
            From: John Baldwin <jhb@FreeBSD.org>
            To: arch@FreeBSD.org
            Subject: Convert P_COWINPROGRESS to per-thread lock-less flag..
            Cc: mckusick@mckusick.com
            X-ASK-Info: Whitelist match

            As part of the proc locking, I have a patch that converts the
            per-process P_COWINPROGRESS flag to a per-thread flag instead.
            The per-thread flag is a TDP_COWINPROGRESS flag stored in
            td_pflags which does not require any locks. This removes the
            last user of p_flag that does not use the proc lock. Are there
            any problems with making this flag per-thread instead of
            per-process?

            http://www.FreeBSD.org/~jhb/patches/cow.patch

            --

            John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
            "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/

    I do not see any problems with it being per-thread.

            Kirk McKusick
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