From: Andrew Morton <akpm@linux-foundation.org>
To: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mgorman@suse.de>,
Johannes Weiner <hannes@cmpxchg.org>,
Minchan Kim <minchan@kernel.org>, Dave Hansen <dave@sr71.net>,
Michal Nazarewicz <mina86@mina86.com>,
Jungsoo Son <jungsoo.son@lge.com>, Ingo Molnar <mingo@redhat.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 3/8] mm/debug-pagealloc: make debug-pagealloc boottime configurable
Date: Mon, 24 Nov 2014 14:55:42 -0800 [thread overview]
Message-ID: <20141124145542.08b97076.akpm@linux-foundation.org> (raw)
In-Reply-To: <1416816926-7756-4-git-send-email-iamjoonsoo.kim@lge.com>
On Mon, 24 Nov 2014 17:15:21 +0900 Joonsoo Kim <iamjoonsoo.kim@lge.com> wrote:
> Now, we have prepared to avoid using debug-pagealloc in boottime. So
> introduce new kernel-parameter to disable debug-pagealloc in boottime,
> and makes related functions to be disabled in this case.
>
> Only non-intuitive part is change of guard page functions. Because
> guard page is effective only if debug-pagealloc is enabled, turning off
> according to debug-pagealloc is reasonable thing to do.
>
> ...
>
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -858,6 +858,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> causing system reset or hang due to sending
> INIT from AP to BSP.
>
> + disable_debug_pagealloc
> + [KNL] When CONFIG_DEBUG_PAGEALLOC is set, this
> + parameter allows user to disable it at boot time.
> + With this parameter, we can avoid allocating huge
> + chunk of memory for debug pagealloc and then
> + the system will work mostly same with the kernel
> + built without CONFIG_DEBUG_PAGEALLOC.
> +
Weren't we going to make this default to "off", require a boot option
to turn debug_pagealloc on?
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next prev parent reply other threads:[~2014-11-24 22:55 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-24 8:15 [PATCH v3 0/8] Resurrect and use struct page extension for some debugging features Joonsoo Kim
2014-11-24 8:15 ` [PATCH v3 1/8] mm/page_ext: resurrect struct page extending code for debugging Joonsoo Kim
2014-12-03 1:18 ` Joonsoo Kim
2014-11-24 8:15 ` [PATCH v3 2/8] mm/debug-pagealloc: prepare boottime configurable on/off Joonsoo Kim
2014-11-27 12:35 ` Paul Bolle
2014-11-28 7:35 ` Joonsoo Kim
2014-12-22 9:10 ` Paul Bolle
2014-12-23 4:56 ` Joonsoo Kim
2014-11-24 8:15 ` [PATCH v3 3/8] mm/debug-pagealloc: make debug-pagealloc boottime configurable Joonsoo Kim
2014-11-24 22:55 ` Andrew Morton [this message]
2014-11-24 23:42 ` Joonsoo Kim
2014-11-26 20:49 ` Andrew Morton
2014-11-27 5:10 ` Joonsoo Kim
2014-11-24 8:15 ` [PATCH v3 4/8] mm/nommu: use alloc_pages_exact() rather than it's own implementation Joonsoo Kim
2014-11-24 8:15 ` [PATCH v3 5/8] stacktrace: introduce snprint_stack_trace for buffer output Joonsoo Kim
2014-11-24 22:57 ` Andrew Morton
2014-11-24 23:46 ` Joonsoo Kim
2014-11-24 8:15 ` [PATCH v3 6/8] mm/page_owner: keep track of page owners Joonsoo Kim
2014-12-03 13:24 ` Chintan Pandya
2014-12-04 6:56 ` Joonsoo Kim
2014-11-24 8:15 ` [PATCH v3 7/8] mm/page_owner: correct owner information for early allocated pages Joonsoo Kim
2014-11-24 8:15 ` [PATCH v3 8/8] Documentation: add new page_owner document Joonsoo Kim
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