linux-kernel - Re: [PATCH] sysctl_panic_on

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Message-Id: <1176855875.3959.7.camel@dhcp83-56.boston.redhat.com>
Date:	Tue, 17 Apr 2007 20:24:35 -0400
From:	Larry Woodman <lwoodman@...hat.com>
To:	Christoph Lameter <clameter@....com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sysctl_panic_on_oom broken

On Tue, 2007-04-17 at 14:39 -0700, Christoph Lameter wrote:

> 
> It recreates the old problem that we OOM while we still have memory 
> in other parts of the system.

How, by the time we get here we have already decided we are going to
OOMkill or panic.  This change just obeys sysctl_panic_on_oom before
killing current.

-----------------------------------------------------------------------
        /* check if we are going to panic before enything else... */
        if (sysctl_panic_on_oom)
                panic("out of memory. panic_on_oom is selected\n");
        /*
         * Check if there were limitations on the allocation
         * NUMA) that may require different handling.
         */
        switch (constrained_alloc(zonelist, gfp_mask)) {
        case CONSTRAINT_MEMORY_POLICY:
                oom_kill_process(current, points,
                                "No available memory (MPOL_BIND)");
                break;

        case CONSTRAINT_CPUSET:
                oom_kill_process(current, points,
                                "No available memory in cpuset");
                break;

        case CONSTRAINT_NONE:
retry:
                /*
                 * Rambo mode: Shoot down a process and hope
                 * issues we may have.
                 */
                p = select_bad_process(&points);

                if (PTR_ERR(p) == -1UL)
                        goto out;

                /* Found nothing?!?! Either we hang or we panic. */


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