sh: convert /proc/cpu/aligmnent, /proc/cpu/kernel_alignment to seq_file

[safe/jmp/linux-2.6] / Documentation / cputopology.txt

diff --git a/Documentation/cputopology.txt b/Documentation/cputopology.txt
index b41f3e5..f1c5c4b 100644 (file)
--- a/Documentation/cputopology.txt
+++ b/Documentation/cputopology.txt
@@ -1,15 +1,28 @@
 
-Export cpu topology info via sysfs. Items (attributes) are similar
+Export CPU topology info via sysfs. Items (attributes) are similar
 to /proc/cpuinfo.
 
 1) /sys/devices/system/cpu/cpuX/topology/physical_package_id:
-represent the physical package id of  cpu X;
+
+       physical package id of cpuX. Typically corresponds to a physical
+       socket number, but the actual value is architecture and platform
+       dependent.
+
 2) /sys/devices/system/cpu/cpuX/topology/core_id:
-represent the cpu core id to cpu X;
+
+       the CPU core ID of cpuX. Typically it is the hardware platform's
+       identifier (rather than the kernel's).  The actual value is
+       architecture and platform dependent.
+
 3) /sys/devices/system/cpu/cpuX/topology/thread_siblings:
-represent the thread siblings to cpu X in the same core;
+
+       internel kernel map of cpuX's hardware threads within the same
+       core as cpuX
+
 4) /sys/devices/system/cpu/cpuX/topology/core_siblings:
-represent the thread siblings to cpu X in the same physical package;
+
+       internal kernel map of cpuX's hardware threads within the same
+       physical_package_id.
 
 To implement it in an architecture-neutral way, a new source file,
 drivers/base/topology.c, is to export the 4 attributes.
@@ -32,32 +45,32 @@ not defined by include/asm-XXX/topology.h:
 3) thread_siblings: just the given CPU
 4) core_siblings: just the given CPU
 
-Additionally, cpu topology information is provided under
+Additionally, CPU topology information is provided under
 /sys/devices/system/cpu and includes these files.  The internal
 source for the output is in brackets ("[]").
 
-    kernel_max: the maximum cpu index allowed by the kernel configuration.
+    kernel_max: the maximum CPU index allowed by the kernel configuration.
                [NR_CPUS-1]
 
-    offline:   cpus that are not online because they have been
+    offline:   CPUs that are not online because they have been
                HOTPLUGGED off (see cpu-hotplug.txt) or exceed the limit
-               of cpus allowed by the kernel configuration (kernel_max
+               of CPUs allowed by the kernel configuration (kernel_max
                above). [~cpu_online_mask + cpus >= NR_CPUS]
 
-    online:    cpus that are online and being scheduled [cpu_online_mask]
+    online:    CPUs that are online and being scheduled [cpu_online_mask]
 
-    possible:  cpus that have been allocated resources and can be
+    possible:  CPUs that have been allocated resources and can be
                brought online if they are present. [cpu_possible_mask]
 
-    present:   cpus that have been identified as being present in the
+    present:   CPUs that have been identified as being present in the
                system. [cpu_present_mask]
 
 The format for the above output is compatible with cpulist_parse()
 [see <linux/cpumask.h>].  Some examples follow.
 
-In this example, there are 64 cpus in the system but cpus 32-63 exceed
+In this example, there are 64 CPUs in the system but cpus 32-63 exceed
 the kernel max which is limited to 0..31 by the NR_CPUS config option
-being 32.  Note also that cpus 2 and 4-31 are not online but could be
+being 32.  Note also that CPUs 2 and 4-31 are not online but could be
 brought online as they are both present and possible.
 
      kernel_max: 31
@@ -67,8 +80,8 @@ brought online as they are both present and possible.
         present: 0-31
 
 In this example, the NR_CPUS config option is 128, but the kernel was
-started with possible_cpus=144.  There are 4 cpus in the system and cpu2
-was manually taken offline (and is the only cpu that can be brought
+started with possible_cpus=144.  There are 4 CPUs in the system and cpu2
+was manually taken offline (and is the only CPU that can be brought
 online.)
 
      kernel_max: 127
@@ -78,4 +91,4 @@ online.)
         present: 0-3
 
 See cpu-hotplug.txt for the possible_cpus=NUM kernel start parameter
-as well as more information on the various cpumask's.
+as well as more information on the various cpumasks.