linux-kernel - Re: [PATCH 1/4] mm: Provide kernel parameter to allow disabling page init poisoning

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Message-ID: <68ccf46e-8c1e-c796-df35-afb5b295d6ea@intel.com>
Date:   Wed, 12 Sep 2018 09:43:27 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Alexander Duyck <alexander.duyck@...il.com>, mhocko@...nel.org,
        pavel.tatashin@...rosoft.com, dan.j.williams@...el.com
Cc:     linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        linux-nvdimm@...ts.01.org, dave.jiang@...el.com,
        Ingo Molnar <mingo@...nel.org>, jglisse@...hat.com,
        Andrew Morton <akpm@...ux-foundation.org>, logang@...tatee.com,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH 1/4] mm: Provide kernel parameter to allow disabling page
 init poisoning

On 09/12/2018 09:36 AM, Alexander Duyck wrote:
>>         vm_debug =      [KNL] Available with CONFIG_DEBUG_VM=y.
>>                         May slow down boot speed, especially on larger-
>>                         memory systems when enabled.
>>                         off: turn off all runtime VM debug features
>>                         all: turn on all debug features (default)
> This would introduce a significant amount of code change if we do it
> as a parameter that has control over everything.

Sure, but don't do that now.  Just put page poisoning under it now.