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Date: Wed, 21 Nov 2012 14:44:19 +0900
From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To: Tang Chen <tangchen@...fujitsu.com>
CC: <wency@...fujitsu.com>, <linfeng@...fujitsu.com>,
<rob@...dley.net>, <akpm@...ux-foundation.org>,
<laijs@...fujitsu.com>, <jiang.liu@...wei.com>,
<kosaki.motohiro@...fujitsu.com>, <minchan.kim@...il.com>,
<mgorman@...e.de>, <rientjes@...gle.com>, <yinghai@...nel.org>,
<rusty@...tcorp.com.au>, <linux-kernel@...r.kernel.org>,
<linux-mm@...ck.org>, <linux-doc@...r.kernel.org>
Subject: Re: [PATCH 2/5] page_alloc: Add movablecore_map boot option.
Hi Tang,
The patch has two extra whitespaces.
2012/11/19 23:27, Tang Chen wrote:
> This patch adds functions to parse movablecore_map boot option. Since the
> option could be specified more then once, all the maps will be stored in
> the global variable movablecore_map.map array.
>
> And also, we keep the array in monotonic increasing order by start_pfn.
> And merge all overlapped ranges.
>
> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> Reviewed-by: Wen Congyang <wency@...fujitsu.com>
> Tested-by: Lin Feng <linfeng@...fujitsu.com>
> ---
> Documentation/kernel-parameters.txt | 17 ++++
> include/linux/mm.h | 11 +++
> mm/page_alloc.c | 146 +++++++++++++++++++++++++++++++++++
> 3 files changed, 174 insertions(+), 0 deletions(-)
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 9776f06..0718976 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1620,6 +1620,23 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> that the amount of memory usable for all allocations
> is not too small.
>
> + movablecore_map=nn[KMG]@ss[KMG]
> + [KNL,X86,IA-64,PPC] This parameter is similar to
> + memmap except it specifies the memory map of
> + ZONE_MOVABLE.
> + If more areas are all within one node, then from
> + lowest ss to the end of the node will be ZONE_MOVABLE.
> + If an area covers two or more nodes, the area from
> + ss to the end of the 1st node will be ZONE_MOVABLE,
> + and all the rest nodes will only have ZONE_MOVABLE.
^ here
> + If memmap is specified at the same time, the
> + movablecore_map will be limited within the memmap
> + areas. If kernelcore or movablecore is also specified,
> + movablecore_map will have higher priority to be
> + satisfied. So the administrator should be careful that
> + the amount of movablecore_map areas are not too large.
> + Otherwise kernel won't have enough memory to start.
> +
> MTD_Partition= [MTD]
> Format: <name>,<region-number>,<size>,<offset>
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index fa06804..e4541b4 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1328,6 +1328,17 @@ extern void free_bootmem_with_active_regions(int nid,
> unsigned long max_low_pfn);
> extern void sparse_memory_present_with_active_regions(int nid);
>
> +#define MOVABLECORE_MAP_MAX MAX_NUMNODES
> +struct movablecore_entry {
> + unsigned long start; /* start pfn of memory segment */
> + unsigned long end; /* end pfn of memory segment */
> +};
> +
> +struct movablecore_map {
> + __u32 nr_map;
> + struct movablecore_entry map[MOVABLECORE_MAP_MAX];
> +};
> +
> #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
>
> #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 5b74de6..198106f 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -198,6 +198,9 @@ static unsigned long __meminitdata nr_all_pages;
> static unsigned long __meminitdata dma_reserve;
>
> #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
> +/* Movable memory segments, will also be used by memblock subsystem. */
> +struct movablecore_map movablecore_map;
> +
> static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES];
> static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
> static unsigned long __initdata required_kernelcore;
> @@ -4986,6 +4989,149 @@ static int __init cmdline_parse_movablecore(char *p)
> early_param("kernelcore", cmdline_parse_kernelcore);
> early_param("movablecore", cmdline_parse_movablecore);
>
> +/**
> + * insert_movablecore_map - Insert a memory range in to movablecore_map.map.
> + * @start_pfn: start pfn of the range
> + * @end_pfn: end pfn of the range
> + *
> + * This function will also merge the overlapped ranges, and sort the array
> + * by start_pfn in monotonic increasing order.
> + */
> +static void __init insert_movablecore_map(unsigned long start_pfn,
> + unsigned long end_pfn)
> +{
> + int i, pos_start, pos_end, remove;
> + bool merge = true;
> +
> + if (!movablecore_map.nr_map) {
> + movablecore_map.map[0].start = start_pfn;
> + movablecore_map.map[0].end = end_pfn;
> + movablecore_map.nr_map++;
> + return;
> + }
> +
> + /*
> + * pos_start at the 1st overlapped segment if merge_start is true,
> + * or at the next unoverlapped segment if merge_start is false.
> + */
> + for (pos_start = 0; pos_start < movablecore_map.nr_map; pos_start++)
> + if (start_pfn <= movablecore_map.map[pos_start].end) {
> + if (end_pfn < movablecore_map.map[pos_start].start)
> + merge = false;
> + break;
> + }
> +
> + /*
> + * pos_end at the last overlapped segment if merge_end is true,
> + * or at the next unoverlapped segment if merge_start is false.
> + */
> + for (pos_end = pos_start; pos_end < movablecore_map.nr_map; pos_end++) {
> + if (end_pfn < movablecore_map.map[pos_end].start) {
> + if (pos_end > 0 && start_pfn > movablecore_map.map[pos_end-1].end)
> + merge = false;
> + else
> + pos_end--;
> + break;
> + }
> + }
> + if (pos_end == movablecore_map.nr_map && merge)
> + pos_end--;
> +
> + if (pos_start == movablecore_map.nr_map)
> + merge = false;
> +
> + if (merge) {
> + remove = pos_end - pos_start;
> +
> + movablecore_map.map[pos_start].start =
> + min(start_pfn, movablecore_map.map[pos_start].start);
> + movablecore_map.map[pos_start].end =
^ here
Thanks,
Yasuaki Ishimatsu
> + max(end_pfn, movablecore_map.map[pos_end].end);
> +
> + if (remove == 0)
> + goto out;
> +
> + for (i = pos_start+1; i < movablecore_map.nr_map; i++) {
> + movablecore_map.map[i].start =
> + movablecore_map.map[i+remove].start;
> + movablecore_map.map[i].end =
> + movablecore_map.map[i+remove].end;
> + }
> +
> + movablecore_map.nr_map -= remove;
> + } else {
> + for (i = movablecore_map.nr_map; i > pos_start; i--) {
> + movablecore_map.map[i].start =
> + movablecore_map.map[i-1].start;
> + movablecore_map.map[i].end =
> + movablecore_map.map[i-1].end;
> + }
> +
> + movablecore_map.map[pos_start].start = start_pfn;
> + movablecore_map.map[pos_start].end = end_pfn;
> + movablecore_map.nr_map++;
> + }
> +}
> +
> +/**
> + * movablecore_map_add_region - Add a memory range into movablecore_map.
> + * @start: physical start address of range
> + * @end: physical end address of range
> + *
> + * This function transform the physical address into pfn, and then add the
> + * range into movablecore_map by calling insert_movablecore_map().
> + */
> +static void __init movablecore_map_add_region(u64 start, u64 size)
> +{
> + unsigned long start_pfn, end_pfn;
> +
> + if (start + size <= start)
> + return;
> +
> + if (movablecore_map.nr_map >= ARRAY_SIZE(movablecore_map.map)) {
> + pr_err("movable_memory_map: too many entries;"
> + " ignoring [mem %#010llx-%#010llx]\n",
> + (unsigned long long) start,
> + (unsigned long long) (start + size - 1));
> + return;
> + }
> +
> + start_pfn = PFN_DOWN(start);
> + end_pfn = PFN_UP(start + size);
> + insert_movablecore_map(start_pfn, end_pfn);
> +}
> +
> +/*
> + * movablecore_map=nn[KMG]@ss[KMG] sets the region of memory to be used as
> + * movable memory.
> + */
> +static int __init cmdline_parse_movablecore_map(char *p)
> +{
> + char *oldp;
> + u64 start_at, mem_size;
> +
> + if (!p)
> + goto err;
> +
> + oldp = p;
> + mem_size = memparse(p, &p);
> + if (p == oldp)
> + goto err;
> +
> + if (*p == '@') {
> + oldp = p + 1;
> + start_at = memparse(p+1, &p);
> + if (p == oldp || *p != '\0')
> + goto err;
> +
> + movablecore_map_add_region(start_at, mem_size);
> + return 0;
> + }
> +err:
> + return -EINVAL;
> +}
> +early_param("movablecore_map", cmdline_parse_movablecore_map);
> +
> #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
>
> /**
>
--
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