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  1. 30 6月, 2006 1 次提交
  3. 06 6月, 2006 2 次提交
  5. 26 4月, 2006 1 次提交
  7. 11 4月, 2006 1 次提交
  9. 01 4月, 2006 4 次提交
  11. 28 3月, 2006 2 次提交
  13. 23 3月, 2006 1 次提交
    • G
      [PATCH] x86: SMP alternatives · 9a0b5817
      由 Gerd Hoffmann 提交于 
      Implement SMP alternatives, i.e.  switching at runtime between different
code versions for UP and SMP.  The code can patch both SMP->UP and UP->SMP.
The UP->SMP case is useful for CPU hotplug.

With CONFIG_CPU_HOTPLUG enabled the code switches to UP at boot time and
when the number of CPUs goes down to 1, and switches to SMP when the number
of CPUs goes up to 2.

Without CONFIG_CPU_HOTPLUG or on non-SMP-capable systems the code is
patched once at boot time (if needed) and the tables are released
afterwards.

The changes in detail:

  * The current alternatives bits are moved to a separate file,
    the SMP alternatives code is added there.

  * The patch adds some new elf sections to the kernel:
    .smp_altinstructions
	like .altinstructions, also contains a list
	of alt_instr structs.
    .smp_altinstr_replacement
	like .altinstr_replacement, but also has some space to
	save original instruction before replaving it.
    .smp_locks
	list of pointers to lock prefixes which can be nop'ed
	out on UP.
    The first two are used to replace more complex instruction
    sequences such as spinlocks and semaphores.  It would be possible
    to deal with the lock prefixes with that as well, but by handling
    them as special case the table sizes become much smaller.

 * The sections are page-aligned and padded up to page size, so they
   can be free if they are not needed.

 * Splitted the code to release init pages to a separate function and
   use it to release the elf sections if they are unused.
Signed-off-by: NGerd Hoffmann <kraxel@suse.de>
Signed-off-by: NChuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      9a0b5817
  15. 02 2月, 2006 3 次提交
  17. 19 1月, 2006 3 次提交
  19. 13 1月, 2006 1 次提交
  21. 11 1月, 2006 1 次提交
  23. 10 1月, 2006 1 次提交
  25. 09 1月, 2006 3 次提交
  27. 23 11月, 2005 1 次提交
  29. 07 11月, 2005 2 次提交
  31. 31 10月, 2005 2 次提交
  33. 30 10月, 2005 1 次提交
    • H
      [PATCH] mm: pte_offset_map_lock loops · 705e87c0
      由 Hugh Dickins 提交于 
      Convert those common loops using page_table_lock on the outside and
pte_offset_map within to use just pte_offset_map_lock within instead.

These all hold mmap_sem (some exclusively, some not), so at no level can a
page table be whipped away from beneath them.  But whereas pte_alloc loops
tested with the "atomic" pmd_present, these loops are testing with pmd_none,
which on i386 PAE tests both lower and upper halves.

That's now unsafe, so add a cast into pmd_none to test only the vital lower
half: we lose a little sensitivity to a corrupt middle directory, but not
enough to worry about.  It appears that i386 and UML were the only
architectures vulnerable in this way, and pgd and pud no problem.
Signed-off-by: NHugh Dickins <hugh@veritas.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      705e87c0
  35. 28 10月, 2005 2 次提交
  37. 05 10月, 2005 1 次提交
  39. 30 9月, 2005 1 次提交
  41. 23 9月, 2005 1 次提交
  43. 22 9月, 2005 1 次提交
  45. 18 9月, 2005 2 次提交
    • J
      [PATCH] uml: UML/i386 cmpxchg fix · 30134492
      由 Jeff Dike 提交于 
      Using native cmpxchg offers a slight performance improvement in uml/i386.
Signed-off-by: NJeff Dike <jdike@addtoit.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      30134492
    • J
      [PATCH] uml: breakpoint an arbitrary thread · 3eddddcf
      由 Jeff Dike 提交于 
      This patch implements a stack trace for a thread, not unlike sysrq-t does.
The advantage to this is that a break point can be placed on showreqs, so that
upon showing the stack, you jump immediately into the debugger.  While sysrq-t
does the same thing, sysrq-t shows *all* threads stacks.  It also doesn't work
right now.  In the future, I thought it might be acceptable to make this show
all pids stacks, but perhaps leaving well enough alone and just using sysrq-t
would be okay.  For now, upon receiving the stack command, UML switches
context to that thread, dumps its registers, and then switches context back to
the original thread.  Since UML compacts all threads into one of 4 host
threads, this sort of mechanism could be expanded in the future to include
other debugging helpers that sysrq does not cover.

Note by jdike - The main benefit to this is that it brings an arbitrary thread
back into context, where it can be examined by gdb.  The fact that it dumps it
stack is secondary.  This provides the capability to examine a sleeping
thread, which has existed in tt mode, but not in skas mode until now.

Also, the other threads, that sysrq doesn't cover, can be gdb-ed directly
anyway.

Signed-off-by: Allan Graves<allan.graves@gmail.com>
Signed-off-by: NJeff Dike <jdike@addtoit.com>
Cc: Paolo Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      3eddddcf
  47. 11 9月, 2005 2 次提交