1. 09 8月, 2012 1 次提交
  2. 23 10月, 2010 1 次提交
  3. 27 7月, 2010 1 次提交
  4. 23 7月, 2010 1 次提交
  5. 25 6月, 2008 1 次提交
    • J
      xen: implement ptep_modify_prot_start/commit · e57778a1
      Jeremy Fitzhardinge 提交于
      Xen has a pte update function which will update a pte while preserving
      its accessed and dirty bits.  This means that ptep_modify_prot_start() can be
      implemented as a simple read of the pte value.  The hardware may
      update the pte in the meantime, but ptep_modify_prot_commit() updates it while
      preserving any changes that may have happened in the meantime.
      
      The updates in ptep_modify_prot_commit() are batched if we're currently in lazy
      mmu mode.
      
      The mmu_update hypercall can take a batch of updates to perform, but
      this code doesn't make particular use of that feature, in favour of
      using generic multicall batching to get them all into the hypervisor.
      
      The net effect of this is that each mprotect pte update turns from two
      expensive trap-and-emulate faults into they hypervisor into a single
      hypercall whose cost is amortized in a batched multicall.
      Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
      Acked-by: NLinus Torvalds <torvalds@linux-foundation.org>
      Acked-by: NHugh Dickins <hugh@veritas.com>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      e57778a1
  6. 18 7月, 2007 1 次提交