1. 26 6月, 2006 1 次提交
    • C
      [PATCH] page migration: Support a vma migration function · 7b2259b3
      Christoph Lameter 提交于
      Hooks for calling vma specific migration functions
      
      With this patch a vma may define a vma->vm_ops->migrate function.  That
      function may perform page migration on its own (some vmas may not contain page
      structs and therefore cannot be handled by regular page migration.  Pages in a
      vma may require special preparatory treatment before migration is possible
      etc) .  Only mmap_sem is held when the migration function is called.  The
      migrate() function gets passed two sets of nodemasks describing the source and
      the target of the migration.  The flags parameter either contains
      
      MPOL_MF_MOVE	which means that only pages used exclusively by
      		the specified mm should be moved
      
      or
      
      MPOL_MF_MOVE_ALL which means that pages shared with other processes
      		should also be moved.
      
      The migration function returns 0 on success or an error condition.  An error
      condition will prevent regular page migration from occurring.
      
      On its own this patch cannot be included since there are no users for this
      functionality.  But it seems that the uncached allocator will need this
      functionality at some point.
      Signed-off-by: NChristoph Lameter <clameter@sgi.com>
      Cc: Hugh Dickins <hugh@veritas.com>
      Cc: Andi Kleen <ak@muc.de>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      7b2259b3
  2. 23 6月, 2006 5 次提交
    • C
      [PATCH] page migration: sys_move_pages(): support moving of individual pages · 742755a1
      Christoph Lameter 提交于
      move_pages() is used to move individual pages of a process. The function can
      be used to determine the location of pages and to move them onto the desired
      node. move_pages() returns status information for each page.
      
      long move_pages(pid, number_of_pages_to_move,
      		addresses_of_pages[],
      		nodes[] or NULL,
      		status[],
      		flags);
      
      The addresses of pages is an array of void * pointing to the
      pages to be moved.
      
      The nodes array contains the node numbers that the pages should be moved
      to. If a NULL is passed instead of an array then no pages are moved but
      the status array is updated. The status request may be used to determine
      the page state before issuing another move_pages() to move pages.
      
      The status array will contain the state of all individual page migration
      attempts when the function terminates. The status array is only valid if
      move_pages() completed successfullly.
      
      Possible page states in status[]:
      
      0..MAX_NUMNODES	The page is now on the indicated node.
      
      -ENOENT		Page is not present
      
      -EACCES		Page is mapped by multiple processes and can only
      		be moved if MPOL_MF_MOVE_ALL is specified.
      
      -EPERM		The page has been mlocked by a process/driver and
      		cannot be moved.
      
      -EBUSY		Page is busy and cannot be moved. Try again later.
      
      -EFAULT		Invalid address (no VMA or zero page).
      
      -ENOMEM		Unable to allocate memory on target node.
      
      -EIO		Unable to write back page. The page must be written
      		back in order to move it since the page is dirty and the
      		filesystem does not provide a migration function that
      		would allow the moving of dirty pages.
      
      -EINVAL		A dirty page cannot be moved. The filesystem does not provide
      		a migration function and has no ability to write back pages.
      
      The flags parameter indicates what types of pages to move:
      
      MPOL_MF_MOVE	Move pages that are only mapped by the process.
      
      MPOL_MF_MOVE_ALL Also move pages that are mapped by multiple processes.
      		Requires sufficient capabilities.
      
      Possible return codes from move_pages()
      
      -ENOENT		No pages found that would require moving. All pages
      		are either already on the target node, not present, had an
      		invalid address or could not be moved because they were
      		mapped by multiple processes.
      
      -EINVAL		Flags other than MPOL_MF_MOVE(_ALL) specified or an attempt
      		to migrate pages in a kernel thread.
      
      -EPERM		MPOL_MF_MOVE_ALL specified without sufficient priviledges.
      		or an attempt to move a process belonging to another user.
      
      -EACCES		One of the target nodes is not allowed by the current cpuset.
      
      -ENODEV		One of the target nodes is not online.
      
      -ESRCH		Process does not exist.
      
      -E2BIG		Too many pages to move.
      
      -ENOMEM		Not enough memory to allocate control array.
      
      -EFAULT		Parameters could not be accessed.
      
      A test program for move_pages() may be found with the patches
      on ftp.kernel.org:/pub/linux/kernel/people/christoph/pmig/patches-2.6.17-rc4-mm3
      
      From: Christoph Lameter <clameter@sgi.com>
      
        Detailed results for sys_move_pages()
      
        Pass a pointer to an integer to get_new_page() that may be used to
        indicate where the completion status of a migration operation should be
        placed.  This allows sys_move_pags() to report back exactly what happened to
        each page.
      
        Wish there would be a better way to do this. Looks a bit hacky.
      Signed-off-by: NChristoph Lameter <clameter@sgi.com>
      Cc: Hugh Dickins <hugh@veritas.com>
      Cc: Jes Sorensen <jes@trained-monkey.org>
      Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
      Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
      Cc: Andi Kleen <ak@muc.de>
      Cc: Michael Kerrisk <mtk-manpages@gmx.net>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      742755a1
    • C
      [PATCH] page migration: use allocator function for migrate_pages() · 95a402c3
      Christoph Lameter 提交于
      Instead of passing a list of new pages, pass a function to allocate a new
      page.  This allows the correct placement of MPOL_INTERLEAVE pages during page
      migration.  It also further simplifies the callers of migrate pages.
      migrate_pages() becomes similar to migrate_pages_to() so drop
      migrate_pages_to().  The batching of new page allocations becomes unnecessary.
      Signed-off-by: NChristoph Lameter <clameter@sgi.com>
      Cc: Hugh Dickins <hugh@veritas.com>
      Cc: Jes Sorensen <jes@trained-monkey.org>
      Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
      Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
      Cc: Andi Kleen <ak@muc.de>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      95a402c3
    • C
      [PATCH] page migration: handle freeing of pages in migrate_pages() · aaa994b3
      Christoph Lameter 提交于
      Do not leave pages on the lists passed to migrate_pages().  Seems that we will
      not need any postprocessing of pages.  This will simplify the handling of
      pages by the callers of migrate_pages().
      Signed-off-by: NChristoph Lameter <clameter@sgi.com>
      Cc: Hugh Dickins <hugh@veritas.com>
      Cc: Jes Sorensen <jes@trained-monkey.org>
      Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
      Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
      Cc: Andi Kleen <ak@muc.de>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      aaa994b3
    • C
      [PATCH] page migration cleanup: pass "mapping" to migration functions · 2d1db3b1
      Christoph Lameter 提交于
      Change handling of address spaces.
      
      Pass a pointer to the address space in which the page is migrated to all
      migration function.  This avoids repeatedly having to retrieve the address
      space pointer from the page and checking it for validity.  The old page
      mapping will change once migration has gone to a certain step, so it is less
      confusing to have the pointer always available.
      
      Move the setting of the mapping and index for the new page into
      migrate_pages().
      Signed-off-by: NChristoph Lameter <clameter@sgi.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      2d1db3b1
    • C
      [PATCH] page migration cleanup: remove useless definitions · e7340f73
      Christoph Lameter 提交于
      Remove the export for migrate_page_remove_references() and migrate_page_copy()
      that are unlikely to be used directly by filesystems implementing migration.
      The export was useful when buffer_migrate_page() lived in fs/buffer.c but it
      has now been moved to migrate.c in the migration reorg.
      Signed-off-by: NChristoph Lameter <clameter@sgi.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      e7340f73
  3. 26 4月, 2006 1 次提交
  4. 01 4月, 2006 1 次提交
  5. 22 3月, 2006 1 次提交
    • C
      [PATCH] page migration reorg · b20a3503
      Christoph Lameter 提交于
      Centralize the page migration functions in anticipation of additional
      tinkering.  Creates a new file mm/migrate.c
      
      1. Extract buffer_migrate_page() from fs/buffer.c
      
      2. Extract central migration code from vmscan.c
      
      3. Extract some components from mempolicy.c
      
      4. Export pageout() and remove_from_swap() from vmscan.c
      
      5. Make it possible to configure NUMA systems without page migration
         and non-NUMA systems with page migration.
      
      I had to so some #ifdeffing in mempolicy.c that may need a cleanup.
      Signed-off-by: NChristoph Lameter <clameter@sgi.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      b20a3503