linux-kernel - Re: [PATCH V4 2/6] mm: mlock: Add new mlock, munlock, and munlockall system calls

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Date:	Wed, 22 Jul 2015 11:16:10 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Eric B Munson <emunson@...mai.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Michal Hocko <mhocko@...e.cz>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Guenter Roeck <linux@...ck-us.net>,
	linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	adi-buildroot-devel@...ts.sourceforge.net,
	linux-cris-kernel@...s.com, linux-ia64@...r.kernel.org,
	linux-m68k@...ts.linux-m68k.org, linux-mips@...ux-mips.org,
	linux-am33-list@...hat.com, linux-parisc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
	linux-xtensa@...ux-xtensa.org, linux-api@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH V4 2/6] mm: mlock: Add new mlock, munlock, and munlockall
 system calls

On 07/21/2015 09:59 PM, Eric B Munson wrote:
> With the refactored mlock code, introduce new system calls for mlock,
> munlock, and munlockall.  The new calls will allow the user to specify
> what lock states are being added or cleared.  mlock2 and munlock2 are
> trivial at the moment, but a follow on patch will add a new mlock state
> making them useful.
>
> munlock2 addresses a limitation of the current implementation.  If a

   ^ munlockall2?

> user calls mlockall(MCL_CURRENT | MCL_FUTURE) and then later decides
> that MCL_FUTURE should be removed, they would have to call munlockall()
> followed by mlockall(MCL_CURRENT) which could potentially be very
> expensive.  The new munlockall2 system call allows a user to simply
> clear the MCL_FUTURE flag.
>

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