From: Sudeep Holla <sudeep.holla@arm.com>
To: Taku Izumi <izumi.taku@jp.fujitsu.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
akpm@linux-foundation.org
Cc: Sudeep Holla <sudeep.holla@arm.com>,
tony.luck@intel.com, qiuxishi@huawei.com,
kamezawa.hiroyu@jp.fujitsu.com, mel@csn.ul.ie,
dave.hansen@intel.com, matt@codeblueprint.co.uk, arnd@arndb.de,
steve.capper@linaro.org
Subject: Re: [PATCH v4 2/2] mm/page_alloc.c: introduce kernelcore=mirror option
Date: Fri, 8 Jan 2016 17:02:39 +0000 [thread overview]
Message-ID: <568FEBAF.9040405@arm.com> (raw)
In-Reply-To: <1452241613-19680-1-git-send-email-izumi.taku@jp.fujitsu.com>
On 08/01/16 08:26, Taku Izumi wrote:
> This patch extends existing "kernelcore" option and introduces
> kernelcore=mirror option. By specifying "mirror" instead of specifying
> the amount of memory, non-mirrored (non-reliable) region will be arranged
> into ZONE_MOVABLE.
>
> v1 -> v2:
> - Refine so that the following case also can be
> handled properly:
>
> Node X: |MMMMMM------MMMMMM--------|
> (legend) M: mirrored -: not mirrrored
>
> In this case, ZONE_NORMAL and ZONE_MOVABLE are
> arranged like bellow:
>
> Node X: |MMMMMM------MMMMMM--------|
> |ooooooxxxxxxooooooxxxxxxxx| ZONE_NORMAL
> |ooooooxxxxxxoooooooo| ZONE_MOVABLE
> (legend) o: present x: absent
>
> v2 -> v3:
> - Fix build with CONFIG_HAVE_MEMBLOCK_NODE_MAP=n
> - No functional change in case of CONFIG_HAVE_MEMBLOCK_NODE_MAP=y
>
> Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
> ---
> Documentation/kernel-parameters.txt | 12 +++-
> mm/page_alloc.c | 114 ++++++++++++++++++++++++++++++++++--
> 2 files changed, 119 insertions(+), 7 deletions(-)
>
[...]
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index efb8996..b528328 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -260,6 +260,7 @@ static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
> static unsigned long __initdata required_kernelcore;
> static unsigned long __initdata required_movablecore;
> static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES];
> +static bool mirrored_kernelcore;
>
> /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
> int movable_zone;
> @@ -4613,6 +4614,9 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
> unsigned long pfn;
> struct zone *z;
> unsigned long nr_initialised = 0;
> +#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
> + struct memblock_region *r = NULL, *tmp;
> +#endif
>
> if (highest_memmap_pfn < end_pfn - 1)
> highest_memmap_pfn = end_pfn - 1;
> @@ -4639,6 +4643,40 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
> if (!update_defer_init(pgdat, pfn, end_pfn,
> &nr_initialised))
> break;
> +
> + /*
> + * if not mirrored_kernelcore and ZONE_MOVABLE exists,
> + * range from zone_movable_pfn[nid] to end of each node
> + * should be ZONE_MOVABLE not ZONE_NORMAL. skip it.
> + */
> + if (!mirrored_kernelcore && zone_movable_pfn[nid])
> + if (zone == ZONE_NORMAL &&
> + pfn >= zone_movable_pfn[nid])
> + continue;
> +
I tried this with today's -next, the above lines gave compilation error.
Moved them below into HAVE_MEMBLOCK_NODE_MAP and tested it on ARM64.
I don't see the previous backtraces. Let me know if that's correct or
you can post a version that compiles correctly and I can give a try.
> +#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
> + /*
> + * check given memblock attribute by firmware which
> + * can affect kernel memory layout.
> + * if zone==ZONE_MOVABLE but memory is mirrored,
> + * it's an overlapped memmap init. skip it.
> + */
> + if (mirrored_kernelcore && zone == ZONE_MOVABLE) {
> + if (!r ||
> + pfn >= memblock_region_memory_end_pfn(r)) {
> + for_each_memblock(memory, tmp)
> + if (pfn < memblock_region_memory_end_pfn(tmp))
> + break;
> + r = tmp;
> + }
> + if (pfn >= memblock_region_memory_base_pfn(r) &&
> + memblock_is_mirror(r)) {
> + /* already initialized as NORMAL */
> + pfn = memblock_region_memory_end_pfn(r);
> + continue;
> + }
> + }
> +#endif
> }
--
Regards,
Sudeep
next prev parent reply other threads:[~2016-01-08 17:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-08 8:25 [PATCH v4 0/2] mm: Introduce kernelcore=mirror option Taku Izumi
2016-01-08 8:26 ` Taku Izumi
2016-01-08 8:26 ` [PATCH v4 1/2] mm/page_alloc.c: calculate zone_start_pfn at zone_spanned_pages_in_node() Taku Izumi
2016-01-08 8:26 ` [PATCH v4 2/2] mm/page_alloc.c: introduce kernelcore=mirror option Taku Izumi
2016-01-08 17:02 ` Sudeep Holla [this message]
2016-01-08 23:12 ` Andrew Morton
2016-01-11 9:56 ` Sudeep Holla
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