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Date: Mon, 4 Apr 2016 09:31:01 +0200 From: Michal Hocko <mhocko@...nel.org> To: Piotr Kwapulinski <kwapulinski.piotr@...il.com> Cc: akpm@...ux-foundation.org, mtk.manpages@...il.com, cmetcalf@...lanox.com, arnd@...db.de, viro@...iv.linux.org.uk, mszeredi@...e.cz, dave@...olabs.net, kirill.shutemov@...ux.intel.com, vbabka@...e.cz, mingo@...nel.org, dan.j.williams@...el.com, dave.hansen@...ux.intel.com, koct9i@...il.com, hannes@...xchg.org, jack@...e.cz, xiexiuqi@...wei.com, iamjoonsoo.kim@....com, oleg@...hat.com, gang.chen.5i5j@...il.com, aarcange@...hat.com, aryabinin@...tuozzo.com, rientjes@...gle.com, denc716@...il.com, toshi.kani@....com, ldufour@...ux.vnet.ibm.com, kuleshovmail@...il.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-arch@...r.kernel.org Subject: Re: [PATCH 0/3] mm/mmap.c: don't unmap the overlapping VMA(s) On Sat 02-04-16 21:17:31, Piotr Kwapulinski wrote: > Currently the mmap(MAP_FIXED) discards the overlapping part of the > existing VMA(s). > Introduce the new MAP_DONTUNMAP flag which forces the mmap to fail > with ENOMEM whenever the overlapping occurs and MAP_FIXED is set. > No existing mapping(s) is discarded. You forgot to tell us what is the use case for this new flag. -- Michal Hocko SUSE Labs
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