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Date: Tue, 29 Dec 2015 12:48:44 +0300
From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: LKML <linux-kernel@vger.kernel.org>, Linux MM <linux-mm@kvack.org>,
        Quentin Casasnovas <quentin.casasnovas@oracle.com>,
        Vegard Nossum <vegard.nossum@oracle.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linuxfoundation.org>, Willy Tarreau <w@1wt.eu>,
        Andy Lutomirski <luto@amacapital.net>, Kees Cook <keescook@google.com>,
        Vladimir Davydov <vdavydov@virtuozzo.com>,
        Konstantin Khlebnikov <koct9i@gmail.com>,
        Pavel Emelyanov <xemul@virtuozzo.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH RFC] mm: Rework virtual memory accounting
Message-ID: <20151229094844.GN2194@uranus>
References: <20151228211015.GL2194@uranus>
 <20151228151002.0a8e44199d31f7a4fa7fc414@linux-foundation.org>
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On Mon, Dec 28, 2015 at 03:10:02PM -0800, Andrew Morton wrote:
> On Tue, 29 Dec 2015 00:10:15 +0300 Cyrill Gorcunov <gorcunov@gmail.com> wrote:
...
> 
> This clashes with
> mm-mmapc-remove-redundant-local-variables-for-may_expand_vm.patch,
> below.  I resolved it thusly:
> 
> bool may_expand_vm(struct mm_struct *mm, vm_flags_t flags, unsigned long npages)
> {
> 	if (mm->total_vm + npages > rlimit(RLIMIT_AS) >> PAGE_SHIFT)
> 		return false;
> 
> 	if ((flags & (VM_WRITE | VM_SHARED | (VM_STACK_FLAGS &
> 				(VM_GROWSUP | VM_GROWSDOWN)))) == VM_WRITE)
> 		return mm->data_vm + npages <= rlimit(RLIMIT_DATA);
> 
> 	return true;
> }

Thanks, Andrew!