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| author | Eric W. Biederman <ebiederm@xmission.com> | 2006-09-26 10:52:35 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-09-26 10:52:35 +0200 |
| commit | ba4d40bb5c465f0a4dcc30d02dab80c2cb7e1ff3 (patch) | |
| tree | 12b10f26f5efddb15ef8a75a1eff38771334365d /include/asm-x86_64/percpu.h | |
| parent | 522e93e3fcdbf00ba85c72fde6df28cfc0486a65 (diff) | |
| download | op-kernel-dev-ba4d40bb5c465f0a4dcc30d02dab80c2cb7e1ff3.zip op-kernel-dev-ba4d40bb5c465f0a4dcc30d02dab80c2cb7e1ff3.tar.gz | |
[PATCH] Auto size the per cpu area.
Now for a completely different but trivial approach.
I just boot tested it with 255 CPUS and everything worked.
Currently everything (except module data) we place in
the per cpu area we know about at compile time. So
instead of allocating a fixed size for the per_cpu area
allocate the number of bytes we need plus a fixed constant
for to be used for modules.
It isn't perfect but it is much less of a pain to
work with than what we are doing now.
AK: fixed warning
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/asm-x86_64/percpu.h')
| -rw-r--r-- | include/asm-x86_64/percpu.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-x86_64/percpu.h b/include/asm-x86_64/percpu.h index 08dd9f9..39d2bab 100644 --- a/include/asm-x86_64/percpu.h +++ b/include/asm-x86_64/percpu.h @@ -11,6 +11,16 @@ #include <asm/pda.h> +#ifdef CONFIG_MODULES +# define PERCPU_MODULE_RESERVE 8192 +#else +# define PERCPU_MODULE_RESERVE 0 +#endif + +#define PERCPU_ENOUGH_ROOM \ + (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \ + PERCPU_MODULE_RESERVE) + #define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset) #define __my_cpu_offset() read_pda(data_offset) |
