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Date: Thu, 06 Sep 2007 15:14:20 +0100
From: Mel Gorman <mel@....ul.ie>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] CONFIG_ZONE_MOVABLE [1/2] zone ifdef cleanup by
renumbering
On Fri, 2007-08-31 at 19:13 +0900, KAMEZAWA Hiroyuki wrote:
> zone_ifdef_cleanup_by_renumbering.patch
>
> Now, this patch defines zone_idx for not-configured-zones.
> like
> enum_zone_type {
> (ZONE_DMA configured)
> (ZONE_DMA32 configured)
> ZONE_NORMAL
> (ZONE_HIGHMEM configured)
> ZONE_MOVABLE
> MAX_NR_ZONES,
> (ZONE_DMA not-configured)
> (ZONE_DMA32 not-configured)
> (ZONE_HIGHMEM not-configured)
> };
>
> By this, we can determine zone is configured or not by
>
> zone_idx < MAX_NR_ZONES.
>
> We can avoid #ifdef for CONFIG_ZONE_xxx to some extent.
>
> This patch also replaces CONFIG_ZONE_DMA_FLAG by is_configured_zone(ZONE_DMA).
>
> Changelog: v2 -> v3
> - updated against 2.6.23-rc3-mm1.
> Changelog: v1 -> v2
> - rebased to 2.6.23-rc1
> - Removed MAX_POSSIBLE_ZONES
> - Added comments
>
I like this patchset in general. No immediate problems are jumping out
at me as to why this would be delayed unless it is known to have
annoying collision problems.
> Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
>
> include/linux/gfp.h | 18 ++++-------
> include/linux/mmzone.h | 79 ++++++++++++++++++++++++++++++-------------------
> include/linux/vmstat.h | 24 +++++++-------
> mm/Kconfig | 5 ---
> mm/page-writeback.c | 7 +---
> mm/page_alloc.c | 33 ++++++++------------
> mm/slab.c | 4 +-
> 7 files changed, 87 insertions(+), 83 deletions(-)
>
> Index: devel-2.6.23-rc3-mm1/include/linux/mmzone.h
> ===================================================================
> --- devel-2.6.23-rc3-mm1.orig/include/linux/mmzone.h
> +++ devel-2.6.23-rc3-mm1/include/linux/mmzone.h
> @@ -178,10 +178,36 @@ enum zone_type {
> ZONE_HIGHMEM,
> #endif
> ZONE_MOVABLE,
> - MAX_NR_ZONES
> + MAX_NR_ZONES,
> +#ifndef CONFIG_ZONE_DMA
> + ZONE_DMA,
> +#endif
> +#ifndef CONFIG_ZONE_DMA32
> + ZONE_DMA32,
> +#endif
> +#ifndef CONFIG_HIGHMEM
> + ZONE_HIGHMEM,
> +#endif
> };
>
> /*
> + * Test zone type is configured or not.
> + * You can use this function for avoiding #ifdef.
> + *
> + * #ifdef CONFIG_ZONE_DMA
> + * do_something...
> + * #endif
> + * can be written as
> + * if (is_configured_zone(ZONE_DMA)) {
> + * do_something..
> + * }
> + */
> +static inline int is_configured_zone(enum zone_type zoneidx)
> +{
> + return (zoneidx < MAX_NR_ZONES);
> +}
> +
> +/*
> * When a memory allocation must conform to specific limitations (such
> * as being suitable for DMA) the caller will pass in hints to the
> * allocator in the gfp_mask, in the zone modifier bits. These bits
> @@ -573,28 +599,35 @@ static inline int populated_zone(struct
>
> extern int movable_zone;
>
> -static inline int zone_movable_is_highmem(void)
> +/*
> + * Check zone is configured && specified "idx" is equal to target zone type.
> + * Zone's index is calucalted by above zone_idx().
> + */
> +static inline int zone_idx_is(enum zone_type idx, enum zone_type target)
> {
> -#if defined(CONFIG_HIGHMEM) && defined(CONFIG_ARCH_POPULATES_NODE_MAP)
> - return movable_zone == ZONE_HIGHMEM;
> -#else
> + if (is_configured_zone(target) && (idx == target))
> + return 1;
> return 0;
> +}
> +
> +static inline int zone_movable_is_highmem(void)
> +{
> +#if CONFIG_ARCH_POPULATES_NODE_MAP
> + if (is_configured_zone(ZONE_HIGHMEM))
> + return movable_zone == ZONE_HIGHMEM;
> #endif
> + return 0;
> }
>
> static inline int is_highmem_idx(enum zone_type idx)
> {
> -#ifdef CONFIG_HIGHMEM
> - return (idx == ZONE_HIGHMEM ||
> - (idx == ZONE_MOVABLE && zone_movable_is_highmem()));
> -#else
> - return 0;
> -#endif
> + return (zone_idx_is(idx, ZONE_HIGHMEM) ||
> + (zone_idx_is(idx, ZONE_MOVABLE) && zone_movable_is_highmem()));
> }
>
> static inline int is_normal_idx(enum zone_type idx)
> {
> - return (idx == ZONE_NORMAL);
> + return zone_idx_is(idx, ZONE_NORMAL);
> }
>
> /**
> @@ -605,36 +638,22 @@ static inline int is_normal_idx(enum zon
> */
> static inline int is_highmem(struct zone *zone)
> {
> -#ifdef CONFIG_HIGHMEM
> - int zone_idx = zone - zone->zone_pgdat->node_zones;
> - return zone_idx == ZONE_HIGHMEM ||
> - (zone_idx == ZONE_MOVABLE && zone_movable_is_highmem());
> -#else
> - return 0;
> -#endif
> + return is_highmem_idx(zone_idx(zone));
> }
>
> static inline int is_normal(struct zone *zone)
> {
> - return zone == zone->zone_pgdat->node_zones + ZONE_NORMAL;
> + return zone_idx_is(zone_idx(zone), ZONE_NORMAL);
> }
>
> static inline int is_dma32(struct zone *zone)
> {
> -#ifdef CONFIG_ZONE_DMA32
> - return zone == zone->zone_pgdat->node_zones + ZONE_DMA32;
> -#else
> - return 0;
> -#endif
> + return zone_idx_is(zone_idx(zone), ZONE_DMA32);
> }
>
> static inline int is_dma(struct zone *zone)
> {
> -#ifdef CONFIG_ZONE_DMA
> - return zone == zone->zone_pgdat->node_zones + ZONE_DMA;
> -#else
> - return 0;
> -#endif
> + return zone_idx_is(zone_idx(zone), ZONE_DMA);
> }
>
> /* These two functions are used to setup the per zone pages min values */
> Index: devel-2.6.23-rc3-mm1/include/linux/vmstat.h
> ===================================================================
> --- devel-2.6.23-rc3-mm1.orig/include/linux/vmstat.h
> +++ devel-2.6.23-rc3-mm1/include/linux/vmstat.h
> @@ -159,19 +159,19 @@ static inline unsigned long node_page_st
> enum zone_stat_item item)
> {
> struct zone *zones = NODE_DATA(node)->node_zones;
> + unsigned long val = zone_page_state(&zones[ZONE_NORMAL],item);
>
> - return
> -#ifdef CONFIG_ZONE_DMA
> - zone_page_state(&zones[ZONE_DMA], item) +
> -#endif
> -#ifdef CONFIG_ZONE_DMA32
> - zone_page_state(&zones[ZONE_DMA32], item) +
> -#endif
> -#ifdef CONFIG_HIGHMEM
> - zone_page_state(&zones[ZONE_HIGHMEM], item) +
> -#endif
> - zone_page_state(&zones[ZONE_NORMAL], item) +
> - zone_page_state(&zones[ZONE_MOVABLE], item);
> + if (is_configured_zone(ZONE_DMA))
> + val += zone_page_state(&zones[ZONE_DMA], item);
> +
> + if (is_configured_zone(ZONE_DMA32))
> + val += zone_page_state(&zones[ZONE_DMA32], item);
> +
> + if (is_configured_zone(ZONE_HIGHMEM))
> + val += zone_page_state(&zones[ZONE_HIGHMEM], item);
> +
> + val += zone_page_state(&zones[ZONE_MOVABLE], item);
> + return val;
> }
>
> extern void zone_statistics(struct zonelist *, struct zone *);
> Index: devel-2.6.23-rc3-mm1/mm/Kconfig
> ===================================================================
> --- devel-2.6.23-rc3-mm1.orig/mm/Kconfig
> +++ devel-2.6.23-rc3-mm1/mm/Kconfig
> @@ -176,11 +176,6 @@ config RESOURCES_64BIT
> help
> This option allows memory and IO resources to be 64 bit.
>
> -config ZONE_DMA_FLAG
> - int
> - default "0" if !ZONE_DMA
> - default "1"
> -
> config BOUNCE
> def_bool y
> depends on BLOCK && MMU && (ZONE_DMA || HIGHMEM)
> Index: devel-2.6.23-rc3-mm1/mm/page_alloc.c
> ===================================================================
> --- devel-2.6.23-rc3-mm1.orig/mm/page_alloc.c
> +++ devel-2.6.23-rc3-mm1/mm/page_alloc.c
> @@ -100,18 +100,12 @@ int sysctl_lowmem_reserve_ratio[MAX_NR_Z
>
> EXPORT_SYMBOL(totalram_pages);
>
> -static char * const zone_names[MAX_NR_ZONES] = {
> -#ifdef CONFIG_ZONE_DMA
> - "DMA",
> -#endif
> -#ifdef CONFIG_ZONE_DMA32
> - "DMA32",
> -#endif
> - "Normal",
> -#ifdef CONFIG_HIGHMEM
> - "HighMem",
> -#endif
> - "Movable",
> +static char * const zone_names[] = {
> + [ZONE_DMA] = "DMA",
> + [ZONE_DMA32] = "DMA32",
> + [ZONE_NORMAL] = "Normal",
> + [ZONE_HIGHMEM] = "HighMem",
> + [ZONE_MOVABLE] = "Movable",
> };
This part here means that we always store the strings for zones whether
they are configured or not. I don't think it's worth getting worried
about. Is it worth marking it __read_mostly while you are altering the
array?
>
> int min_free_kbytes = 1024;
> @@ -1863,14 +1857,15 @@ void si_meminfo_node(struct sysinfo *val
>
> val->totalram = pgdat->node_present_pages;
> val->freeram = node_page_state(nid, NR_FREE_PAGES);
> -#ifdef CONFIG_HIGHMEM
> - val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].present_pages;
> - val->freehigh = zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM],
> + if (is_configured_zone(ZONE_HIGHMEM)) {
> + val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].present_pages;
> + val->freehigh =
> + zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM],
> NR_FREE_PAGES);
> -#else
> - val->totalhigh = 0;
> - val->freehigh = 0;
> -#endif
> + } else {
> + val->totalhigh = 0;
> + val->freehigh = 0;
> + }
> val->mem_unit = PAGE_SIZE;
> }
> #endif
> @@ -2436,15 +2431,15 @@ static void build_zonelist_cache(pg_data
> /* Any regular memory on that node ? */
> static void check_for_regular_memory(pg_data_t *pgdat)
> {
> -#ifdef CONFIG_HIGHMEM
> enum zone_type zone_type;
> + if (!is_configured_zone(ZONE_HIGHMEM))
> + return;
>
> for (zone_type = 0; zone_type <= ZONE_NORMAL; zone_type++) {
> struct zone *zone = &pgdat->node_zones[zone_type];
> if (zone->present_pages)
> node_set_state(zone_to_nid(zone), N_NORMAL_MEMORY);
> }
> -#endif
> }
>
> /* return values int ....just for stop_machine_run() */
> Index: devel-2.6.23-rc3-mm1/mm/slab.c
> ===================================================================
> --- devel-2.6.23-rc3-mm1.orig/mm/slab.c
> +++ devel-2.6.23-rc3-mm1/mm/slab.c
> @@ -2365,7 +2365,7 @@ kmem_cache_create (const char *name, siz
> cachep->slab_size = slab_size;
> cachep->flags = flags;
> cachep->gfpflags = 0;
> - if (CONFIG_ZONE_DMA_FLAG && (flags & SLAB_CACHE_DMA))
> + if (is_configured_zone(ZONE_DMA) && (flags & SLAB_CACHE_DMA))
> cachep->gfpflags |= GFP_DMA;
> cachep->buffer_size = size;
> cachep->reciprocal_buffer_size = reciprocal_value(size);
> @@ -2686,7 +2686,7 @@ static void cache_init_objs(struct kmem_
>
> static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags)
> {
> - if (CONFIG_ZONE_DMA_FLAG) {
> + if (is_configured_zone(ZONE_DMA)) {
> if (flags & GFP_DMA)
> BUG_ON(!(cachep->gfpflags & GFP_DMA));
> else
> Index: devel-2.6.23-rc3-mm1/include/linux/gfp.h
> ===================================================================
> --- devel-2.6.23-rc3-mm1.orig/include/linux/gfp.h
> +++ devel-2.6.23-rc3-mm1/include/linux/gfp.h
> @@ -121,26 +121,22 @@ static inline enum zone_type gfp_zone(gf
> {
> int base = 0;
>
> -#ifdef CONFIG_NUMA
> if (flags & __GFP_THISNODE)
> base = MAX_NR_ZONES;
> -#endif
>
> -#ifdef CONFIG_ZONE_DMA
> - if (flags & __GFP_DMA)
> + if (is_configured_zone(ZONE_DMA) && (flags & __GFP_DMA))
> return base + ZONE_DMA;
> -#endif
> -#ifdef CONFIG_ZONE_DMA32
> - if (flags & __GFP_DMA32)
> +
> + if (is_configured_zone(ZONE_DMA32) && (flags & __GFP_DMA32))
> return base + ZONE_DMA32;
> -#endif
> +
> if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) ==
> (__GFP_HIGHMEM | __GFP_MOVABLE))
> return base + ZONE_MOVABLE;
> -#ifdef CONFIG_HIGHMEM
> - if (flags & __GFP_HIGHMEM)
> +
> + if (is_configured_zone(ZONE_HIGHMEM) && (flags & __GFP_HIGHMEM))
> return base + ZONE_HIGHMEM;
> -#endif
> +
> return base + ZONE_NORMAL;
> }
>
> Index: devel-2.6.23-rc3-mm1/mm/page-writeback.c
> ===================================================================
> --- devel-2.6.23-rc3-mm1.orig/mm/page-writeback.c
> +++ devel-2.6.23-rc3-mm1/mm/page-writeback.c
> @@ -122,10 +122,12 @@ static void background_writeout(unsigned
>
> static unsigned long highmem_dirtyable_memory(unsigned long total)
> {
> -#ifdef CONFIG_HIGHMEM
> int node;
> unsigned long x = 0;
>
> + if (!is_configured_zone(ZONE_HIGHMEM))
> + return 0;
> +
> for_each_node_state(node, N_HIGH_MEMORY) {
> struct zone *z =
> &NODE_DATA(node)->node_zones[ZONE_HIGHMEM];
> @@ -141,9 +143,6 @@ static unsigned long highmem_dirtyable_m
> * that this does not occur.
> */
> return min(x, total);
> -#else
> - return 0;
> -#endif
> }
>
> static unsigned long determine_dirtyable_memory(void)
>
I haven't tested it but it looks ok so;
Acked-by: Mel Gorman <mel@....ul.ie>
I'll test it early next week when I'm back properly online.
-
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