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| author |   Andrew Morton <akpm@osdl.org> | 2006-02-10 01:51:08 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-10 08:13:12 -0800 |
| commit | 7a8ef1cb774e5438d292365626f9b96616283706 (patch) | |
| tree | 82d085204e8728d28a5267fb39aa2e26ea8824c9 /ipc | |
| parent | [PATCH] Fix building external modules on ppc32 (diff) | |
| download | linux-dev-7a8ef1cb774e5438d292365626f9b96616283706.tar.xz linux-dev-7a8ef1cb774e5438d292365626f9b96616283706.zip | |
[PATCH] x86: don't initialise cpu_possible_map to all ones
Initialising cpu_possible_map to all-ones with CONFIG_HOTPLUG_CPU means that
a) All for_each_cpu() loops will iterate across all NR_CPUS CPUs, rather
than over possible ones. That can be quite expensive.
b) Soon we'll be allocating per-cpu areas only for possible CPUs. So with
CPU_MASK_ALL, we'll be wasting memory.
I also switched voyager over to not use CPU_MASK_ALL in the non-CPU-hotplug
case. Should be OK..
I note that parisc is also using CPU_MASK_ALL. Suggest that it stop doing
that.
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Paul Jackson <pj@sgi.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Zwane Mwaikambo <zwane@linuxpower.ca>
Cc: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'ipc')
0 files changed, 0 insertions, 0 deletions