Re: [lockup] Re: objrmap-core-1 (rmap removal for file mappings to avoid 4:4 in <=16G machines)

From: Ingo Molnar (mingo_at_elte.hu)
Date: 03/09/04

  • Next message: Benjamin Herrenschmidt: "Re: ppc/ppc64 and x86 vsyscalls" 
    Date:	Tue, 9 Mar 2004 12:02:33 +0100
To: Andrea Arcangeli <andrea@suse.de>

    * Ingo Molnar <mingo@elte.hu> wrote:

    > To reproduce, run the attached, very simple test-mmap.c code (as
    > unprivileged user) which maps 80MB worth of shared memory in a
    > finegrained way, creating ~19K vmas, and sleeps. Keep this process
    > around.

    or run the attached test-mmap2.c code, which simulates a very small DB
    app using only 1800 vmas per process: it only maps 8 MB of shm and
    spawns 32 processes. This has an even more lethal effect than the
    previous code.

            Ingo

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