linux-kernel - Re: [discuss] [PATCH] Inconsistent mmap()/mremap() flags

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Date:	Tue, 2 Oct 2007 15:45:32 +0200
From:	Andi Kleen <ak@...e.de>
To:	discuss@...-64.org
Cc:	Hugh Dickins <hugh@...itas.com>, Thayne Harbaugh <thayne@...net>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [discuss] [PATCH] Inconsistent mmap()/mremap() flags


> First call mmap with a low hint address, the new size you'll be wanting
> from the mremap, PROT_NONE, MAP_ANONYMOUS, -1, 0.  Then call mremap with
> old address, old size, new size, MREMAP_MAYMOVE|MREMAP_FIXED, and new
> address as returned by the preparatory mmap.

That's racy unfortunately in a multithreaded process. They would need to loop.

-Andi

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