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  1. 18 Jun, 2004 1 commit
    • Hugh Dickins's avatar
      [PATCH] mm: flush TLB when clearing young · 68dc3ce3
      Hugh Dickins authored 
      Traditionally we've not flushed TLB after clearing the young/referenced bit,
it has seemed just a waste of time.  Russell King points out that on some
architectures, with the move from 2.4 mm sweeping to 2.6 rmap, this may be a
serious omission: very frequently referenced pages never re-marked young, and
the worst choices made for unmapping.

So, replace ptep_test_and_clear_young by ptep_clear_flush_young throughout
rmap.c.  Originally I'd imagined making some kind of TLB gather optimization,
but don't see what now: whether worth it rather depends on how common
cross-cpu flushes are, and whether global or not.

ppc and ppc64 have already found this issue, and worked around it by arranging
TLB flush from their ptep_test_and_clear_young: with the aid of pgtable rmap
pointers.  I'm hoping ptep_clear_flush_young will allow ppc and ppc64 to
remove that special code, but won't change them myself.

It's worth noting that it is Andrea's anon_vma rmap which makes the vma
available for ptep_clear_flush_young in page_referenced_one: anonmm and
pte_chains would both need an additional find_vma for that.
Signed-off-by: default avatarHugh Dickins <hugh@veritas.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      68dc3ce3
  3. 17 Jun, 2004 3 commits
    • Richard Henderson's avatar
      [PATCH] alpha: fix discontigmem+initrd build · 3900b963
      Richard Henderson authored 
      From: Ivan Kokshaysky <ink@jurassic.park.msu.ru>

Compilation fails due to incorrect usage of NODE_DATA().

Reported by hpa.
      3900b963
    • Paul Mackerras's avatar
      [PATCH] ppc64: Optimize exception/syscall entry/exit · 1ab196f3
      Paul Mackerras authored 
      This rewrites the PPC64 exception entry/exit routines to make them
smaller and faster.

In particular we no longer save all of the registers for the common
exceptions - system calls, hardware interrupts and decrementer (timer)
interrupts - only the volatile registers.  The other registers are saved
and restored (if used) by the C functions we call.  This involved
changing the registers we use in early exception processing from r20-r23
to r9-r12, which ended up changing quite a lot of code in head.S. 
Overall this gives us about a 20% reduction in null syscall time. 

Some system calls need all the registers (e.g.  fork/clone/vfork and
[rt_]sigsuspend).  For these the syscall dispatch code calls a stub that
saves the nonvolatile registers before calling the real handler.

This also implements the force_successful_syscall_return() thing for
ppc64.
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      1ab196f3
    • Paul Mackerras's avatar
      [PATCH] ppc64: Implement CONFIG_PREEMPT · 23932693
      Paul Mackerras authored 
      This implements CONFIG_PREEMPT for ppc64.  Aside from the entry.S
changes to check the _TIF_NEED_RESCHED bit when returning from an
exception, there are various changes to make the ppc64-specific code
preempt-safe, mostly adding preempt_enable/disable or get_cpu/put_cpu
calls where needed.  I have been using this on my desktop G5 for the
last week without problems.
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      23932693
  5. 15 Jun, 2004 24 commits
  7. 14 Jun, 2004 12 commits
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