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Commit 6a7d68e8 authored by Miao Xie's avatar Miao Xie Committed by Linus Torvalds
Browse files

cpusets: fix and update Documentation 



Make the doc consistent with current cpusets implementation.

Signed-off-by: default avatarMiao Xie <miaox@cn.fujitsu.com>
Acked-by: default avatarPaul Jackson <pj@sgi.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c337869d

Documentation/cpusets.txt

+6 −3
Original line number Diff line number Diff line
@@ -199,7 +199,7 @@ using the sched_setaffinity, mbind and set_mempolicy system calls. 
The following rules apply to each cpuset:



 - Its CPUs and Memory Nodes must be a subset of its parents.

 - It can only be marked exclusive if its parent is.

 - It can't be marked exclusive unless its parent is.

 - If its cpu or memory is exclusive, they may not overlap any sibling.



These rules, and the natural hierarchy of cpusets, enable efficient
@@ -345,7 +345,7 @@ is modified to perform an inline check for this PF_SPREAD_PAGE task 
flag, and if set, a call to a new routine cpuset_mem_spread_node()

returns the node to prefer for the allocation.



Similarly, setting 'memory_spread_cache' turns on the flag

Similarly, setting 'memory_spread_slab' turns on the flag

PF_SPREAD_SLAB, and appropriately marked slab caches will allocate

pages from the node returned by cpuset_mem_spread_node().
@@ -709,7 +709,10 @@ Now you want to do something with this cpuset. 


In this directory you can find several files:

# ls

cpus  cpu_exclusive  mems  mem_exclusive mem_hardwall  tasks

cpu_exclusive  memory_migrate      mems                      tasks

cpus           memory_pressure     notify_on_release

mem_exclusive  memory_spread_page  sched_load_balance

mem_hardwall   memory_spread_slab  sched_relax_domain_level



Reading them will give you information about the state of this cpuset:

the CPUs and Memory Nodes it can use, the processes that are using