forked from KolibriOS/kolibrios
ddk: 4.4
git-svn-id: svn://kolibrios.org@6082 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Sergey Semyonov (Serge)
@@ -13,7 +13,7 @@ struct vm_area_struct;
|
||||
#define ___GFP_HIGHMEM 0x02u
|
||||
#define ___GFP_DMA32 0x04u
|
||||
#define ___GFP_MOVABLE 0x08u
|
||||
#define ___GFP_WAIT 0x10u
|
||||
#define ___GFP_RECLAIMABLE 0x10u
|
||||
#define ___GFP_HIGH 0x20u
|
||||
#define ___GFP_IO 0x40u
|
||||
#define ___GFP_FS 0x80u
|
||||
@@ -28,17 +28,17 @@ struct vm_area_struct;
|
||||
#define ___GFP_NOMEMALLOC 0x10000u
|
||||
#define ___GFP_HARDWALL 0x20000u
|
||||
#define ___GFP_THISNODE 0x40000u
|
||||
#define ___GFP_RECLAIMABLE 0x80000u
|
||||
#define ___GFP_ATOMIC 0x80000u
|
||||
#define ___GFP_NOACCOUNT 0x100000u
|
||||
#define ___GFP_NOTRACK 0x200000u
|
||||
#define ___GFP_NO_KSWAPD 0x400000u
|
||||
#define ___GFP_DIRECT_RECLAIM 0x400000u
|
||||
#define ___GFP_OTHER_NODE 0x800000u
|
||||
#define ___GFP_WRITE 0x1000000u
|
||||
#define ___GFP_KSWAPD_RECLAIM 0x2000000u
|
||||
/* If the above are modified, __GFP_BITS_SHIFT may need updating */
|
||||
|
||||
/*
|
||||
* GFP bitmasks..
|
||||
*
|
||||
* Zone modifiers (see linux/mmzone.h - low three bits)
|
||||
* Physical address zone modifiers (see linux/mmzone.h - low four bits)
|
||||
*
|
||||
* Do not put any conditional on these. If necessary modify the definitions
|
||||
* without the underscores and use them consistently. The definitions here may
|
||||
@@ -48,109 +48,218 @@ struct vm_area_struct;
|
||||
#define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM)
|
||||
#define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32)
|
||||
#define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* Page is movable */
|
||||
#define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* ZONE_MOVABLE allowed */
|
||||
#define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE)
|
||||
|
||||
/*
|
||||
* Action modifiers - doesn't change the zoning
|
||||
* Page mobility and placement hints
|
||||
*
|
||||
* These flags provide hints about how mobile the page is. Pages with similar
|
||||
* mobility are placed within the same pageblocks to minimise problems due
|
||||
* to external fragmentation.
|
||||
*
|
||||
* __GFP_MOVABLE (also a zone modifier) indicates that the page can be
|
||||
* moved by page migration during memory compaction or can be reclaimed.
|
||||
*
|
||||
* __GFP_RECLAIMABLE is used for slab allocations that specify
|
||||
* SLAB_RECLAIM_ACCOUNT and whose pages can be freed via shrinkers.
|
||||
*
|
||||
* __GFP_WRITE indicates the caller intends to dirty the page. Where possible,
|
||||
* these pages will be spread between local zones to avoid all the dirty
|
||||
* pages being in one zone (fair zone allocation policy).
|
||||
*
|
||||
* __GFP_HARDWALL enforces the cpuset memory allocation policy.
|
||||
*
|
||||
* __GFP_THISNODE forces the allocation to be satisified from the requested
|
||||
* node with no fallbacks or placement policy enforcements.
|
||||
*/
|
||||
#define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE)
|
||||
#define __GFP_WRITE ((__force gfp_t)___GFP_WRITE)
|
||||
#define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL)
|
||||
#define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)
|
||||
|
||||
/*
|
||||
* Watermark modifiers -- controls access to emergency reserves
|
||||
*
|
||||
* __GFP_HIGH indicates that the caller is high-priority and that granting
|
||||
* the request is necessary before the system can make forward progress.
|
||||
* For example, creating an IO context to clean pages.
|
||||
*
|
||||
* __GFP_ATOMIC indicates that the caller cannot reclaim or sleep and is
|
||||
* high priority. Users are typically interrupt handlers. This may be
|
||||
* used in conjunction with __GFP_HIGH
|
||||
*
|
||||
* __GFP_MEMALLOC allows access to all memory. This should only be used when
|
||||
* the caller guarantees the allocation will allow more memory to be freed
|
||||
* very shortly e.g. process exiting or swapping. Users either should
|
||||
* be the MM or co-ordinating closely with the VM (e.g. swap over NFS).
|
||||
*
|
||||
* __GFP_NOMEMALLOC is used to explicitly forbid access to emergency reserves.
|
||||
* This takes precedence over the __GFP_MEMALLOC flag if both are set.
|
||||
*
|
||||
* __GFP_NOACCOUNT ignores the accounting for kmemcg limit enforcement.
|
||||
*/
|
||||
#define __GFP_ATOMIC ((__force gfp_t)___GFP_ATOMIC)
|
||||
#define __GFP_HIGH ((__force gfp_t)___GFP_HIGH)
|
||||
#define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)
|
||||
#define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC)
|
||||
#define __GFP_NOACCOUNT ((__force gfp_t)___GFP_NOACCOUNT)
|
||||
|
||||
/*
|
||||
* Reclaim modifiers
|
||||
*
|
||||
* __GFP_IO can start physical IO.
|
||||
*
|
||||
* __GFP_FS can call down to the low-level FS. Clearing the flag avoids the
|
||||
* allocator recursing into the filesystem which might already be holding
|
||||
* locks.
|
||||
*
|
||||
* __GFP_DIRECT_RECLAIM indicates that the caller may enter direct reclaim.
|
||||
* This flag can be cleared to avoid unnecessary delays when a fallback
|
||||
* option is available.
|
||||
*
|
||||
* __GFP_KSWAPD_RECLAIM indicates that the caller wants to wake kswapd when
|
||||
* the low watermark is reached and have it reclaim pages until the high
|
||||
* watermark is reached. A caller may wish to clear this flag when fallback
|
||||
* options are available and the reclaim is likely to disrupt the system. The
|
||||
* canonical example is THP allocation where a fallback is cheap but
|
||||
* reclaim/compaction may cause indirect stalls.
|
||||
*
|
||||
* __GFP_RECLAIM is shorthand to allow/forbid both direct and kswapd reclaim.
|
||||
*
|
||||
* __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
|
||||
* _might_ fail. This depends upon the particular VM implementation.
|
||||
* _might_ fail. This depends upon the particular VM implementation.
|
||||
*
|
||||
* __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
|
||||
* cannot handle allocation failures. This modifier is deprecated and no new
|
||||
* users should be added.
|
||||
* cannot handle allocation failures. New users should be evaluated carefully
|
||||
* (and the flag should be used only when there is no reasonable failure
|
||||
* policy) but it is definitely preferable to use the flag rather than
|
||||
* opencode endless loop around allocator.
|
||||
*
|
||||
* __GFP_NORETRY: The VM implementation must not retry indefinitely.
|
||||
*
|
||||
* __GFP_MOVABLE: Flag that this page will be movable by the page migration
|
||||
* mechanism or reclaimed
|
||||
* __GFP_NORETRY: The VM implementation must not retry indefinitely and will
|
||||
* return NULL when direct reclaim and memory compaction have failed to allow
|
||||
* the allocation to succeed. The OOM killer is not called with the current
|
||||
* implementation.
|
||||
*/
|
||||
#define __GFP_WAIT ((__force gfp_t)___GFP_WAIT) /* Can wait and reschedule? */
|
||||
#define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */
|
||||
#define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */
|
||||
#define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */
|
||||
#define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */
|
||||
#define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */
|
||||
#define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */
|
||||
#define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */
|
||||
#define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */
|
||||
#define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)/* Allow access to emergency reserves */
|
||||
#define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */
|
||||
#define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */
|
||||
#define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves.
|
||||
* This takes precedence over the
|
||||
* __GFP_MEMALLOC flag if both are
|
||||
* set
|
||||
*/
|
||||
#define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */
|
||||
#define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */
|
||||
#define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */
|
||||
#define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */
|
||||
|
||||
#define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD)
|
||||
#define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */
|
||||
#define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */
|
||||
#define __GFP_IO ((__force gfp_t)___GFP_IO)
|
||||
#define __GFP_FS ((__force gfp_t)___GFP_FS)
|
||||
#define __GFP_DIRECT_RECLAIM ((__force gfp_t)___GFP_DIRECT_RECLAIM) /* Caller can reclaim */
|
||||
#define __GFP_KSWAPD_RECLAIM ((__force gfp_t)___GFP_KSWAPD_RECLAIM) /* kswapd can wake */
|
||||
#define __GFP_RECLAIM ((__force gfp_t)(___GFP_DIRECT_RECLAIM|___GFP_KSWAPD_RECLAIM))
|
||||
#define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT)
|
||||
#define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL)
|
||||
#define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY)
|
||||
|
||||
/*
|
||||
* This may seem redundant, but it's a way of annotating false positives vs.
|
||||
* allocations that simply cannot be supported (e.g. page tables).
|
||||
* Action modifiers
|
||||
*
|
||||
* __GFP_COLD indicates that the caller does not expect to be used in the near
|
||||
* future. Where possible, a cache-cold page will be returned.
|
||||
*
|
||||
* __GFP_NOWARN suppresses allocation failure reports.
|
||||
*
|
||||
* __GFP_COMP address compound page metadata.
|
||||
*
|
||||
* __GFP_ZERO returns a zeroed page on success.
|
||||
*
|
||||
* __GFP_NOTRACK avoids tracking with kmemcheck.
|
||||
*
|
||||
* __GFP_NOTRACK_FALSE_POSITIVE is an alias of __GFP_NOTRACK. It's a means of
|
||||
* distinguishing in the source between false positives and allocations that
|
||||
* cannot be supported (e.g. page tables).
|
||||
*
|
||||
* __GFP_OTHER_NODE is for allocations that are on a remote node but that
|
||||
* should not be accounted for as a remote allocation in vmstat. A
|
||||
* typical user would be khugepaged collapsing a huge page on a remote
|
||||
* node.
|
||||
*/
|
||||
#define __GFP_COLD ((__force gfp_t)___GFP_COLD)
|
||||
#define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN)
|
||||
#define __GFP_COMP ((__force gfp_t)___GFP_COMP)
|
||||
#define __GFP_ZERO ((__force gfp_t)___GFP_ZERO)
|
||||
#define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK)
|
||||
#define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
|
||||
#define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE)
|
||||
|
||||
#define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */
|
||||
/* Room for N __GFP_FOO bits */
|
||||
#define __GFP_BITS_SHIFT 26
|
||||
#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
|
||||
|
||||
/* This equals 0, but use constants in case they ever change */
|
||||
#define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
|
||||
/* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
|
||||
#define GFP_ATOMIC (__GFP_HIGH)
|
||||
#define GFP_NOIO (__GFP_WAIT)
|
||||
#define GFP_NOFS (__GFP_WAIT | __GFP_IO)
|
||||
#define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
|
||||
#define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \
|
||||
/*
|
||||
* Useful GFP flag combinations that are commonly used. It is recommended
|
||||
* that subsystems start with one of these combinations and then set/clear
|
||||
* __GFP_FOO flags as necessary.
|
||||
*
|
||||
* GFP_ATOMIC users can not sleep and need the allocation to succeed. A lower
|
||||
* watermark is applied to allow access to "atomic reserves"
|
||||
*
|
||||
* GFP_KERNEL is typical for kernel-internal allocations. The caller requires
|
||||
* ZONE_NORMAL or a lower zone for direct access but can direct reclaim.
|
||||
*
|
||||
* GFP_NOWAIT is for kernel allocations that should not stall for direct
|
||||
* reclaim, start physical IO or use any filesystem callback.
|
||||
*
|
||||
* GFP_NOIO will use direct reclaim to discard clean pages or slab pages
|
||||
* that do not require the starting of any physical IO.
|
||||
*
|
||||
* GFP_NOFS will use direct reclaim but will not use any filesystem interfaces.
|
||||
*
|
||||
* GFP_USER is for userspace allocations that also need to be directly
|
||||
* accessibly by the kernel or hardware. It is typically used by hardware
|
||||
* for buffers that are mapped to userspace (e.g. graphics) that hardware
|
||||
* still must DMA to. cpuset limits are enforced for these allocations.
|
||||
*
|
||||
* GFP_DMA exists for historical reasons and should be avoided where possible.
|
||||
* The flags indicates that the caller requires that the lowest zone be
|
||||
* used (ZONE_DMA or 16M on x86-64). Ideally, this would be removed but
|
||||
* it would require careful auditing as some users really require it and
|
||||
* others use the flag to avoid lowmem reserves in ZONE_DMA and treat the
|
||||
* lowest zone as a type of emergency reserve.
|
||||
*
|
||||
* GFP_DMA32 is similar to GFP_DMA except that the caller requires a 32-bit
|
||||
* address.
|
||||
*
|
||||
* GFP_HIGHUSER is for userspace allocations that may be mapped to userspace,
|
||||
* do not need to be directly accessible by the kernel but that cannot
|
||||
* move once in use. An example may be a hardware allocation that maps
|
||||
* data directly into userspace but has no addressing limitations.
|
||||
*
|
||||
* GFP_HIGHUSER_MOVABLE is for userspace allocations that the kernel does not
|
||||
* need direct access to but can use kmap() when access is required. They
|
||||
* are expected to be movable via page reclaim or page migration. Typically,
|
||||
* pages on the LRU would also be allocated with GFP_HIGHUSER_MOVABLE.
|
||||
*
|
||||
* GFP_TRANSHUGE is used for THP allocations. They are compound allocations
|
||||
* that will fail quickly if memory is not available and will not wake
|
||||
* kswapd on failure.
|
||||
*/
|
||||
#define GFP_ATOMIC (__GFP_HIGH|__GFP_ATOMIC|__GFP_KSWAPD_RECLAIM)
|
||||
#define GFP_KERNEL (__GFP_RECLAIM | __GFP_IO | __GFP_FS)
|
||||
#define GFP_NOWAIT (__GFP_KSWAPD_RECLAIM)
|
||||
#define GFP_NOIO (__GFP_RECLAIM)
|
||||
#define GFP_NOFS (__GFP_RECLAIM | __GFP_IO)
|
||||
#define GFP_TEMPORARY (__GFP_RECLAIM | __GFP_IO | __GFP_FS | \
|
||||
__GFP_RECLAIMABLE)
|
||||
#define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
|
||||
#define GFP_USER (__GFP_RECLAIM | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
|
||||
#define GFP_DMA __GFP_DMA
|
||||
#define GFP_DMA32 __GFP_DMA32
|
||||
#define GFP_HIGHUSER (GFP_USER | __GFP_HIGHMEM)
|
||||
#define GFP_HIGHUSER_MOVABLE (GFP_HIGHUSER | __GFP_MOVABLE)
|
||||
#define GFP_IOFS (__GFP_IO | __GFP_FS)
|
||||
#define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \
|
||||
__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \
|
||||
__GFP_NO_KSWAPD)
|
||||
#define GFP_TRANSHUGE ((GFP_HIGHUSER_MOVABLE | __GFP_COMP | \
|
||||
__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN) & \
|
||||
~__GFP_KSWAPD_RECLAIM)
|
||||
|
||||
/*
|
||||
* GFP_THISNODE does not perform any reclaim, you most likely want to
|
||||
* use __GFP_THISNODE to allocate from a given node without fallback!
|
||||
*/
|
||||
#ifdef CONFIG_NUMA
|
||||
#define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
|
||||
#else
|
||||
#define GFP_THISNODE ((__force gfp_t)0)
|
||||
#endif
|
||||
|
||||
/* This mask makes up all the page movable related flags */
|
||||
/* Convert GFP flags to their corresponding migrate type */
|
||||
#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
|
||||
#define GFP_MOVABLE_SHIFT 3
|
||||
|
||||
/* Control page allocator reclaim behavior */
|
||||
#define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
|
||||
__GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
|
||||
__GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC)
|
||||
|
||||
/* Control slab gfp mask during early boot */
|
||||
#define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS))
|
||||
|
||||
/* Control allocation constraints */
|
||||
#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
|
||||
|
||||
/* Do not use these with a slab allocator */
|
||||
#define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
|
||||
|
||||
/* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
|
||||
platforms, used as appropriate on others */
|
||||
|
||||
#define GFP_DMA __GFP_DMA
|
||||
|
||||
/* 4GB DMA on some platforms */
|
||||
#define GFP_DMA32 __GFP_DMA32
|
||||
#undef GFP_MOVABLE_MASK
|
||||
#undef GFP_MOVABLE_SHIFT
|
||||
|
||||
static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags)
|
||||
{
|
||||
return gfp_flags & __GFP_DIRECT_RECLAIM;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_HIGHMEM
|
||||
#define OPT_ZONE_HIGHMEM ZONE_HIGHMEM
|
||||
|
||||
Reference in New Issue
Block a user