forked from luck/tmp_suning_uos_patched
4e4785bcf0
There is a check in zonelist_policy that compares pieces of the bitmap obtained from a gfp mask via GFP_ZONETYPES with a zone number in function zonelist_policy(). The bitmap is an ORed mask of __GFP_DMA, __GFP_DMA32 and __GFP_HIGHMEM. The policy_zone is a zone number with the possible values of ZONE_DMA, ZONE_DMA32, ZONE_HIGHMEM and ZONE_NORMAL. These are two different domains of values. For some reason seemed to work before the zone reduction patchset (It definitely works on SGI boxes since we just have one zone and the check cannot fail). With the zone reduction patchset this check definitely fails on systems with two zones if the system actually has memory in both zones. This is because ZONE_NORMAL is selected using no __GFP flag at all and thus gfp_zone(gfpmask) == 0. ZONE_DMA is selected when __GFP_DMA is set. __GFP_DMA is 0x01. So gfp_zone(gfpmask) == 1. policy_zone is set to ZONE_NORMAL (==1) if ZONE_NORMAL and ZONE_DMA are populated. For ZONE_NORMAL gfp_zone(<no _GFP_DMA>) yields 0 which is < policy_zone(ZONE_NORMAL) and so policy is not applied to regular memory allocations! Instead gfp_zone(__GFP_DMA) == 1 which results in policy being applied to DMA allocations! What we realy want in that place is to establish the highest allowable zone for a given gfp_mask. If the highest zone is higher or equal to the policy_zone then memory policies need to be applied. We have such a highest_zone() function in page_alloc.c. So move the highest_zone() function from mm/page_alloc.c into include/linux/gfp.h. On the way we simplify the function and use the new zone_type that was also introduced with the zone reduction patchset plus we also specify the right type for the gfp flags parameter. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
184 lines
6.1 KiB
C
184 lines
6.1 KiB
C
#ifndef __LINUX_GFP_H
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#define __LINUX_GFP_H
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#include <linux/mmzone.h>
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#include <linux/stddef.h>
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#include <linux/linkage.h>
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struct vm_area_struct;
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/*
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* GFP bitmasks..
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*
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* Zone modifiers (see linux/mmzone.h - low three bits)
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*
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* These may be masked by GFP_ZONEMASK to make allocations with this bit
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* set fall back to ZONE_NORMAL.
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*
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* Do not put any conditional on these. If necessary modify the definitions
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* without the underscores and use the consistently. The definitions here may
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* be used in bit comparisons.
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*/
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#define __GFP_DMA ((__force gfp_t)0x01u)
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#define __GFP_HIGHMEM ((__force gfp_t)0x02u)
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#define __GFP_DMA32 ((__force gfp_t)0x04u)
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/*
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* Action modifiers - doesn't change the zoning
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*
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* __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
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* _might_ fail. This depends upon the particular VM implementation.
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*
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* __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
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* cannot handle allocation failures.
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*
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* __GFP_NORETRY: The VM implementation must not retry indefinitely.
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*/
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#define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */
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#define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */
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#define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */
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#define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */
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#define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */
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#define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */
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#define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */
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#define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */
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#define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */
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#define __GFP_NO_GROW ((__force gfp_t)0x2000u)/* Slab internal usage */
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#define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
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#define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
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#define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
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#define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
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#define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */
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#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
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/* if you forget to add the bitmask here kernel will crash, period */
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#define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \
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__GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \
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__GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \
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__GFP_NOMEMALLOC|__GFP_HARDWALL)
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/* This equals 0, but use constants in case they ever change */
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#define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
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/* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
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#define GFP_ATOMIC (__GFP_HIGH)
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#define GFP_NOIO (__GFP_WAIT)
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#define GFP_NOFS (__GFP_WAIT | __GFP_IO)
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#define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
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#define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
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#define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
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__GFP_HIGHMEM)
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/* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
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platforms, used as appropriate on others */
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#define GFP_DMA __GFP_DMA
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/* 4GB DMA on some platforms */
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#define GFP_DMA32 __GFP_DMA32
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static inline int gfp_zone(gfp_t gfp)
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{
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int zone = GFP_ZONEMASK & (__force int) gfp;
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BUG_ON(zone >= GFP_ZONETYPES);
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return zone;
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}
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static inline enum zone_type highest_zone(gfp_t flags)
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{
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if (flags & __GFP_DMA)
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return ZONE_DMA;
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#ifdef CONFIG_ZONE_DMA32
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if (flags & __GFP_DMA32)
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return ZONE_DMA32;
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#endif
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#ifdef CONFIG_HIGHMEM
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if (flags & __GFP_HIGHMEM)
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return ZONE_HIGHMEM;
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#endif
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return ZONE_NORMAL;
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}
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/*
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* There is only one page-allocator function, and two main namespaces to
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* it. The alloc_page*() variants return 'struct page *' and as such
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* can allocate highmem pages, the *get*page*() variants return
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* virtual kernel addresses to the allocated page(s).
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*/
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/*
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* We get the zone list from the current node and the gfp_mask.
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* This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
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*
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* For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
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* optimized to &contig_page_data at compile-time.
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*/
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#ifndef HAVE_ARCH_FREE_PAGE
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static inline void arch_free_page(struct page *page, int order) { }
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#endif
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extern struct page *
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FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *));
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static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
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unsigned int order)
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{
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if (unlikely(order >= MAX_ORDER))
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return NULL;
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/* Unknown node is current node */
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if (nid < 0)
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nid = numa_node_id();
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return __alloc_pages(gfp_mask, order,
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NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask));
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}
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#ifdef CONFIG_NUMA
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extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
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static inline struct page *
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alloc_pages(gfp_t gfp_mask, unsigned int order)
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{
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if (unlikely(order >= MAX_ORDER))
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return NULL;
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return alloc_pages_current(gfp_mask, order);
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}
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extern struct page *alloc_page_vma(gfp_t gfp_mask,
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struct vm_area_struct *vma, unsigned long addr);
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#else
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#define alloc_pages(gfp_mask, order) \
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alloc_pages_node(numa_node_id(), gfp_mask, order)
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#define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
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#endif
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#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
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extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order));
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extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask));
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#define __get_free_page(gfp_mask) \
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__get_free_pages((gfp_mask),0)
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#define __get_dma_pages(gfp_mask, order) \
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__get_free_pages((gfp_mask) | GFP_DMA,(order))
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extern void FASTCALL(__free_pages(struct page *page, unsigned int order));
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extern void FASTCALL(free_pages(unsigned long addr, unsigned int order));
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extern void FASTCALL(free_hot_page(struct page *page));
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extern void FASTCALL(free_cold_page(struct page *page));
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#define __free_page(page) __free_pages((page), 0)
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#define free_page(addr) free_pages((addr),0)
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void page_alloc_init(void);
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#ifdef CONFIG_NUMA
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void drain_node_pages(int node);
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#else
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static inline void drain_node_pages(int node) { };
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#endif
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#endif /* __LINUX_GFP_H */
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