1. 31 1月, 2007 1 次提交
    • H
      [PATCH] mm: mremap correct rmap accounting · 701dfbc1
      Hugh Dickins 提交于
      Nick Piggin points out that page accounting on MIPS multiple ZERO_PAGEs
      is not maintained by its move_pte, and could lead to freeing a ZERO_PAGE.
      
      Instead of complicating that move_pte, just forget the minor optimization
      when mremapping, and change the one thing which needed it for correctness
      - filemap_xip use ZERO_PAGE(0) throughout instead of according to address.
      
      [ "There is no block device driver one could use for XIP on mips
         platforms" - Carsten Otte ]
      Signed-off-by: NHugh Dickins <hugh@veritas.com>
      Cc: Nick Piggin <nickpiggin@yahoo.com.au>
      Cc: Andrew Morton <akpm@osdl.org>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Carsten Otte <cotte@de.ibm.com>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      701dfbc1
  2. 23 12月, 2006 1 次提交
  3. 09 12月, 2006 1 次提交
  4. 29 6月, 2006 1 次提交
  5. 11 1月, 2006 1 次提交
  6. 10 1月, 2006 1 次提交
  7. 30 10月, 2005 3 次提交
    • H
      [PATCH] mm: rmap with inner ptlock · c0718806
      Hugh Dickins 提交于
      rmap's page_check_address descend without page_table_lock.  First just
      pte_offset_map in case there's no pte present worth locking for, then take
      page_table_lock for the full check, and pass ptl back to caller in the same
      style as pte_offset_map_lock.  __xip_unmap, page_referenced_one and
      try_to_unmap_one use pte_unmap_unlock.  try_to_unmap_cluster also.
      
      page_check_address reformatted to avoid progressive indentation.  No use is
      made of its one error code, return NULL when it fails.
      Signed-off-by: NHugh Dickins <hugh@veritas.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      c0718806
    • H
      [PATCH] mm: xip_unmap ZERO_PAGE fix · 67b02f11
      Hugh Dickins 提交于
      Small fix to the PageReserved patch: the mips ZERO_PAGE(address) depends on
      address, so __xip_unmap is wrong to initialize page with that before address
      is initialized; and in fact must re-evaluate it each iteration.
      Signed-off-by: NHugh Dickins <hugh@veritas.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      67b02f11
    • N
      [PATCH] core remove PageReserved · b5810039
      Nick Piggin 提交于
      Remove PageReserved() calls from core code by tightening VM_RESERVED
      handling in mm/ to cover PageReserved functionality.
      
      PageReserved special casing is removed from get_page and put_page.
      
      All setting and clearing of PageReserved is retained, and it is now flagged
      in the page_alloc checks to help ensure we don't introduce any refcount
      based freeing of Reserved pages.
      
      MAP_PRIVATE, PROT_WRITE of VM_RESERVED regions is tentatively being
      deprecated.  We never completely handled it correctly anyway, and is be
      reintroduced in future if required (Hugh has a proof of concept).
      
      Once PageReserved() calls are removed from kernel/power/swsusp.c, and all
      arch/ and driver code, the Set and Clear calls, and the PG_reserved bit can
      be trivially removed.
      
      Last real user of PageReserved is swsusp, which uses PageReserved to
      determine whether a struct page points to valid memory or not.  This still
      needs to be addressed (a generic page_is_ram() should work).
      
      A last caveat: the ZERO_PAGE is now refcounted and managed with rmap (and
      thus mapcounted and count towards shared rss).  These writes to the struct
      page could cause excessive cacheline bouncing on big systems.  There are a
      number of ways this could be addressed if it is an issue.
      Signed-off-by: NNick Piggin <npiggin@suse.de>
      
      Refcount bug fix for filemap_xip.c
      Signed-off-by: NCarsten Otte <cotte@de.ibm.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      b5810039
  8. 16 7月, 2005 1 次提交
    • C
      [PATCH] execute-in-place fixes · afa597ba
      Carsten Otte 提交于
      This patch includes feedback from Andrew and Christoph. Thanks for
      taking time to review.
      
      Use of empty_zero_page was eliminated to fix compilation for architectures
      that don't have it.
      
      This patch removes setting pages up-to-date in ext2_get_xip_page and all
      bug checks to verify that the page is indeed up to date.  Setting the page
      state on mapping to userland is bogus.  None of the code patchs involved
      with these pages in mm cares about the page state.
      
      still on my ToDo list: identify a place outside second extended where
      __inode_direct_access should reside
      Signed-off-by: NCarsten Otte <cotte@de.ibm.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      afa597ba
  9. 13 7月, 2005 1 次提交
  10. 24 6月, 2005 2 次提交
    • C
      [PATCH] xip: reduce code duplication · eb6fe0c3
      Carsten Otte 提交于
      This patch reworks filemap_xip.c with the goal to reduce code duplication
      from mm/filemap.c.  It applies agains 2.6.12-rc6-mm1.  Instead of
      implementing the aio functions, this one implements the synchronous
      read/write functions only.  For readv and writev, the generic fallback is
      used.  For aio, we rely on the application doing the fallback.  Since our
      "synchronous" function does memcpy immediately anyway, there is no
      performance difference between using the fallbacks or implementing each
      operation.
      Signed-off-by: NCarsten Otte <cotte@de.ibm.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      eb6fe0c3
    • C
      [PATCH] xip: fs/mm: execute in place · ceffc078
      Carsten Otte 提交于
      - generic_file* file operations do no longer have a xip/non-xip split
      - filemap_xip.c implements a new set of fops that require get_xip_page
        aop to work proper. all new fops are exported GPL-only (don't like to
        see whatever code use those except GPL modules)
      - __xip_unmap now uses page_check_address, which is no longer static
        in rmap.c, and defined in linux/rmap.h
      - mm/filemap.h is now much more clean, plainly having just Linus'
        inline funcs moved here from filemap.c
      - fix includes in filemap_xip to make it build cleanly on i386
      Signed-off-by: NCarsten Otte <cotte@de.ibm.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      ceffc078