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  1. 13 7月, 2007 1 次提交
  3. 03 5月, 2007 1 次提交
  5. 13 2月, 2007 1 次提交
  7. 07 12月, 2006 1 次提交
  9. 26 9月, 2006 1 次提交
  11. 28 6月, 2006 2 次提交
  13. 23 6月, 2006 1 次提交
  15. 26 3月, 2006 1 次提交
  17. 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
  19. 12 1月, 2006 2 次提交
  21. 07 12月, 2005 1 次提交
    • V
      [CPUFREQ] CPU frequency display in /proc/cpuinfo · 95235ca2
      由 Venkatesh Pallipadi 提交于 
      What is the value shown in "cpu MHz" of /proc/cpuinfo when CPUs are capable of
changing frequency?

Today the answer is: It depends.
On i386:
SMP kernel - It is always the boot frequency
UP kernel - Scales with the frequency change and shows that was last set.

On x86_64:
There is one single variable cpu_khz that gets written by all the CPUs. So,
the frequency set by last CPU will be seen on /proc/cpuinfo of all the
CPUs in the system. What you see also depends on whether you have constant_tsc
capable CPU or not.

On ia64:
It is always boot time frequency of a particular CPU that gets displayed.

The patch below changes this to:
Show the last known frequency of the particular CPU, when cpufreq is present. If
cpu doesnot support changing of frequency through cpufreq, then boot frequency
will be shown. The patch affects i386, x86_64 and ia64 architectures.

Signed-off-by: Venkatesh Pallipadi<venkatesh.pallipadi@intel.com>
Signed-off-by: NDave Jones <davej@redhat.com>
      95235ca2
  23. 15 11月, 2005 1 次提交
  25. 31 10月, 2005 1 次提交
  27. 24 6月, 2005 1 次提交
  29. 01 5月, 2005 1 次提交
  31. 17 4月, 2005 4 次提交