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b24f53a0be
NOTE: Once again there is a lot of patch stealing and the end result is sufficiently different that I had to drop the signed-offs. Will re-add if the original authors are ok with that. This patch adds another mbind() flag to request "lazy migration". The flag, MPOL_MF_LAZY, modifies MPOL_MF_MOVE* such that the selected pages are marked PROT_NONE. The pages will be migrated in the fault path on "first touch", if the policy dictates at that time. "Lazy Migration" will allow testing of migrate-on-fault via mbind(). Also allows applications to specify that only subsequently touched pages be migrated to obey new policy, instead of all pages in range. This can be useful for multi-threaded applications working on a large shared data area that is initialized by an initial thread resulting in all pages on one [or a few, if overflowed] nodes. After PROT_NONE, the pages in regions assigned to the worker threads will be automatically migrated local to the threads on 1st touch. Signed-off-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Rik van Riel <riel@redhat.com>
74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/*
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* NUMA memory policies for Linux.
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* Copyright 2003,2004 Andi Kleen SuSE Labs
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*/
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#ifndef _UAPI_LINUX_MEMPOLICY_H
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#define _UAPI_LINUX_MEMPOLICY_H
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#include <linux/errno.h>
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/*
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* Both the MPOL_* mempolicy mode and the MPOL_F_* optional mode flags are
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* passed by the user to either set_mempolicy() or mbind() in an 'int' actual.
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* The MPOL_MODE_FLAGS macro determines the legal set of optional mode flags.
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*/
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/* Policies */
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enum {
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MPOL_DEFAULT,
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MPOL_PREFERRED,
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MPOL_BIND,
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MPOL_INTERLEAVE,
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MPOL_LOCAL,
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MPOL_NOOP, /* retain existing policy for range */
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MPOL_MAX, /* always last member of enum */
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};
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enum mpol_rebind_step {
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MPOL_REBIND_ONCE, /* do rebind work at once(not by two step) */
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MPOL_REBIND_STEP1, /* first step(set all the newly nodes) */
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MPOL_REBIND_STEP2, /* second step(clean all the disallowed nodes)*/
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MPOL_REBIND_NSTEP,
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};
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/* Flags for set_mempolicy */
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#define MPOL_F_STATIC_NODES (1 << 15)
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#define MPOL_F_RELATIVE_NODES (1 << 14)
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/*
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* MPOL_MODE_FLAGS is the union of all possible optional mode flags passed to
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* either set_mempolicy() or mbind().
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*/
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#define MPOL_MODE_FLAGS (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES)
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/* Flags for get_mempolicy */
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#define MPOL_F_NODE (1<<0) /* return next IL mode instead of node mask */
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#define MPOL_F_ADDR (1<<1) /* look up vma using address */
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#define MPOL_F_MEMS_ALLOWED (1<<2) /* return allowed memories */
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/* Flags for mbind */
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#define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */
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#define MPOL_MF_MOVE (1<<1) /* Move pages owned by this process to conform
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to policy */
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#define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to policy */
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#define MPOL_MF_LAZY (1<<3) /* Modifies '_MOVE: lazy migrate on fault */
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#define MPOL_MF_INTERNAL (1<<4) /* Internal flags start here */
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#define MPOL_MF_VALID (MPOL_MF_STRICT | \
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MPOL_MF_MOVE | \
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MPOL_MF_MOVE_ALL | \
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MPOL_MF_LAZY)
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/*
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* Internal flags that share the struct mempolicy flags word with
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* "mode flags". These flags are allocated from bit 0 up, as they
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* are never OR'ed into the mode in mempolicy API arguments.
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*/
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#define MPOL_F_SHARED (1 << 0) /* identify shared policies */
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#define MPOL_F_LOCAL (1 << 1) /* preferred local allocation */
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#define MPOL_F_REBINDING (1 << 2) /* identify policies in rebinding */
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#define MPOL_F_MOF (1 << 3) /* this policy wants migrate on fault */
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#endif /* _UAPI_LINUX_MEMPOLICY_H */
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