Messages in this thread Patch in this message | | | Date | Tue, 20 Dec 2005 17:52:27 +0900 | From | Yasunori Goto <> | Subject | [Patch] New zone ZONE_EASY_RECLAIM take 4. (change build_zonelists)[3/8] |
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This is changing build_zonelists for new zone.
__GFP_xxxs are flag for requires of page allocation which zone is prefered. But, it is used as an index number for zonelists[] too. But after my patch, __GFP_xxx might be set at same time. So, last set bit number of __GFP is recognized for zonelists' index by this patch.
take3->take4: take 3's modification was still wrong. __GFP_EASY_RECLAIM is 0x04 on i386, so fls(__GFP_EASY_RECLAIM) is 3. zone 3 is ZONE_HIGHMEM, not ZONE_EASY_RECLAIM. So, I rearranged __GFP_XXX flags (see: define gfp_easy_relcaim patch) and fls() is used at highest_zone() again.
take2 -> take 3: This patch is modified take 3 to avoid panic on i386. __GFP_DMA32 is 0 for i386. So, ZONE_DMA32 is selected if zone_bits is 0 which means Zone_normal. Zone_DMA32 is not allocated on i386, so kernel paniced by no normal memory. In this patch, even if zone_bits is 0 adn __GFP_DMA32 is 0, Zone_Normal is selected.
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Index: zone_reclaim/mm/page_alloc.c =================================================================== --- zone_reclaim.orig/mm/page_alloc.c 2005-12-19 20:18:29.000000000 +0900 +++ zone_reclaim/mm/page_alloc.c 2005-12-19 20:19:56.000000000 +0900 @@ -1585,14 +1585,11 @@ static int __init build_zonelists_node(p { struct zone *zone; - BUG_ON(zone_type > ZONE_HIGHMEM); + BUG_ON(zone_type > ZONE_EASY_RECLAIM); do { zone = pgdat->node_zones + zone_type; if (populated_zone(zone)) { -#ifndef CONFIG_HIGHMEM - BUG_ON(zone_type > ZONE_NORMAL); -#endif zonelist->zones[nr_zones++] = zone; check_highest_zone(zone_type); } @@ -1605,12 +1602,17 @@ static int __init build_zonelists_node(p static inline int highest_zone(int zone_bits) { int res = ZONE_NORMAL; - if (zone_bits & (__force int)__GFP_HIGHMEM) - res = ZONE_HIGHMEM; - if (zone_bits & (__force int)__GFP_DMA32) - res = ZONE_DMA32; - if (zone_bits & (__force int)__GFP_DMA) + + if (zone_bits == fls((__force int)__GFP_DMA)) res = ZONE_DMA; + if (zone_bits == fls((__force int)__GFP_DMA32) && + (__force int)__GFP_DMA32 == 0x02) + res = ZONE_DMA32; + if (zone_bits == fls((__force int)__GFP_HIGHMEM)) + res = ZONE_HIGHMEM; + if (zone_bits == fls((__force int)__GFP_EASY_RECLAIM)) + res = ZONE_EASY_RECLAIM; + return res; } Index: zone_reclaim/include/linux/gfp.h =================================================================== --- zone_reclaim.orig/include/linux/gfp.h 2005-12-19 20:19:37.000000000 +0900 +++ zone_reclaim/include/linux/gfp.h 2005-12-19 20:19:56.000000000 +0900 @@ -81,7 +81,7 @@ struct vm_area_struct; static inline int gfp_zone(gfp_t gfp) { - int zone = GFP_ZONEMASK & (__force int) gfp; + int zone = fls(GFP_ZONEMASK & (__force int) gfp); BUG_ON(zone >= GFP_ZONETYPES); return zone; } -- Yasunori Goto
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