Messages in this thread Patch in this message | | | From | Mel Gorman <> | Subject | [PATCH 5/7] At boot, determine what zone memory will hot-add to | Date | Fri, 17 Feb 2006 14:17:32 +0000 (GMT) |
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Once ZONE_EASYRCLM is added, the x86 by default adds to ZONE_EASYRCLM and ppc64 by default uses ZONE_DMA. This patch changes the behavior slightly on x86 and ppc64.
o By default, ZONE_DMA is used on ppc64 and ZONE_HIGHMEM is used on x86 o If kernelcore is specified at boot time, x86 and ppc64 hotadd to ZONE_EASYRCLM o If kernelcore and noeasyrclm is used, ppc64 will use ZONE_DMA and x86 will use ZONE_HIGHMEM
This is a list of scenarios and what happens with different options on an x86 with 1.5GiB of physical RAM. ./activate is a script that tries to online all inactive physical memory.
Boot with no special parameters - ./activate does nothing - All high memory in HIGHMEM
Boot with mem=512MB - Machine boots with 512MB active RAM - ./activate adds memory to ZONE_HIGHMEM - No memory in ZONE_EASYRCLM
Boot with kernelcore=512MB - Machine boots with 1.5GiB RAM - ./activate does nothing - No memory in HIGHMEM - Some of what would be NORMAL and all of HIGHMEM is in EASYRCLM
Boot with kernelcore=512MB mem=512MB - Machine boots with 512MB RAM - ./activate adds memory to ZONE_EASYRCLM - No memory in HIGHMEM
Boot with kernelcore=512MB mem=512MB noeasyrclm - Machine boots with 512MB RAM - ./activate adds memory to ZONE_EASYRCLM - No memory in HIGHMEM - With noeasyrclm, this is identical to booting with just mem=512MB
Boot with kernelcore=1024MB mem=1024MB - Machine boots with 1024MB RAM - Some memory already in ZONE_HIGHMEM - ./activate adds memory to ZONE_EASYRCLM
Boot with kernelcore=1024MB mem=1024MB noeasyrclm - Machine boots with 1024MB RAM - Some memory already in ZONE_EASYRCLM - ./activate adds memory to ZONE_HIGHMEM
Signed-off-by: Mel Gorman <mel@csn.ul.ie> diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.16-rc3-mm1-104_ppc64coremem/arch/i386/kernel/setup.c linux-2.6.16-rc3-mm1-106_zonechoose/arch/i386/kernel/setup.c --- linux-2.6.16-rc3-mm1-104_ppc64coremem/arch/i386/kernel/setup.c 2006-02-17 09:42:45.000000000 +0000 +++ linux-2.6.16-rc3-mm1-106_zonechoose/arch/i386/kernel/setup.c 2006-02-17 09:44:16.000000000 +0000 @@ -115,6 +115,8 @@ static unsigned int highmem_pages = -1; /* user-defined easy-reclaim-size */ static unsigned int core_mem_pages = -1; static unsigned int easyrclm_pages = 0; +static int hotadd_zone_offset = -1; + /* * Setup options */ @@ -923,6 +925,18 @@ static void __init parse_cmdline_early ( */ else if (!memcmp(from, "kernelcore=",11)) { core_mem_pages = memparse(from+11, &from) >> PAGE_SHIFT; + + if (hotadd_zone_offset == -1) + hotadd_zone_offset = ZONE_EASYRCLM; + } + + /* + * Once kernelcore= is specified, the default zone to add to + * is ZONE_EASYRCLM. This parameter allows an administrator + * to override that + */ + else if (!memcmp(from, "noeasyrclm", 10)) { + hotadd_zone_offset = ZONE_HIGHMEM; } next_char: @@ -1550,6 +1564,13 @@ void __init setup_arch(char **cmdline_p) tsc_init(); } +struct zone *get_zone_for_hotadd(struct pglist_data *pgdata) { + if (unlikely(hotadd_zone_offset == -1)) + hotadd_zone_offset = ZONE_HIGHMEM; + + return &pgdata->node_zones[hotadd_zone_offset]; +} + #include "setup_arch_post.h" /* * Local Variables: diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.16-rc3-mm1-104_ppc64coremem/arch/i386/mm/init.c linux-2.6.16-rc3-mm1-106_zonechoose/arch/i386/mm/init.c --- linux-2.6.16-rc3-mm1-104_ppc64coremem/arch/i386/mm/init.c 2006-02-16 09:50:41.000000000 +0000 +++ linux-2.6.16-rc3-mm1-106_zonechoose/arch/i386/mm/init.c 2006-02-17 09:44:16.000000000 +0000 @@ -655,7 +655,7 @@ void __init mem_init(void) int add_memory(u64 start, u64 size) { struct pglist_data *pgdata = &contig_page_data; - struct zone *zone = pgdata->node_zones + MAX_NR_ZONES-1; + struct zone *zone = get_zone_for_hotadd(pgdata); unsigned long start_pfn = start >> PAGE_SHIFT; unsigned long nr_pages = size >> PAGE_SHIFT; diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.16-rc3-mm1-104_ppc64coremem/arch/powerpc/mm/mem.c linux-2.6.16-rc3-mm1-106_zonechoose/arch/powerpc/mm/mem.c --- linux-2.6.16-rc3-mm1-104_ppc64coremem/arch/powerpc/mm/mem.c 2006-02-16 09:50:42.000000000 +0000 +++ linux-2.6.16-rc3-mm1-106_zonechoose/arch/powerpc/mm/mem.c 2006-02-17 09:44:16.000000000 +0000 @@ -129,7 +129,7 @@ int __devinit add_memory(u64 start, u64 create_section_mapping(start, start + size); /* this should work for most non-highmem platforms */ - zone = pgdata->node_zones; + zone = get_zone_for_hotadd(pgdata); return __add_pages(zone, start_pfn, nr_pages); diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.16-rc3-mm1-104_ppc64coremem/arch/powerpc/mm/numa.c linux-2.6.16-rc3-mm1-106_zonechoose/arch/powerpc/mm/numa.c --- linux-2.6.16-rc3-mm1-104_ppc64coremem/arch/powerpc/mm/numa.c 2006-02-17 09:43:30.000000000 +0000 +++ linux-2.6.16-rc3-mm1-106_zonechoose/arch/powerpc/mm/numa.c 2006-02-17 09:44:16.000000000 +0000 @@ -39,6 +39,7 @@ EXPORT_SYMBOL(node_data); static bootmem_data_t __initdata plat_node_bdata[MAX_NUMNODES]; static int min_common_depth; static int n_mem_addr_cells, n_mem_size_cells; +static int hotadd_zone_offset = -1; /* * We need somewhere to store start/end/node for each region until we have @@ -736,6 +737,13 @@ void __init paging_init(void) opt += 11; core_mem_size = memparse(opt, &opt); core_mem_pfn = core_mem_size >> PAGE_SHIFT; + hotadd_zone_offset = ZONE_EASYRCLM; + } + + /* Check if the administrator requests only ZONE_DMA be used */ + opt = strstr(cmd_line, "noeasyrclm"); + if (opt) { + hotadd_zone_offset = ZONE_DMA; } for_each_online_node(nid) { @@ -847,4 +855,12 @@ got_numa_domain: } return numa_domain; } + +struct zone *get_zone_for_hotadd(struct pglist_data *pgdata) +{ + if (unlikely(hotadd_zone_offset == -1)) + hotadd_zone_offset = ZONE_DMA; + + return &pgdata->node_zones[hotadd_zone_offset]; +} #endif /* CONFIG_MEMORY_HOTPLUG */ diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.16-rc3-mm1-104_ppc64coremem/include/linux/memory_hotplug.h linux-2.6.16-rc3-mm1-106_zonechoose/include/linux/memory_hotplug.h --- linux-2.6.16-rc3-mm1-104_ppc64coremem/include/linux/memory_hotplug.h 2006-02-13 00:27:25.000000000 +0000 +++ linux-2.6.16-rc3-mm1-106_zonechoose/include/linux/memory_hotplug.h 2006-02-17 09:44:16.000000000 +0000 @@ -57,6 +57,7 @@ extern void online_page(struct page *pag extern int add_memory(u64 start, u64 size); extern int remove_memory(u64 start, u64 size); extern int online_pages(unsigned long, unsigned long); +extern struct zone *get_zone_for_hotadd(struct pglist_data *); /* reasonably generic interface to expand the physical pages in a zone */ extern int __add_pages(struct zone *zone, unsigned long start_pfn, - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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