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[PATCH] Only allocate percpu data for possible CPUs 

percpu_data blindly allocates bootmem memory to store NR_CPUS instances of
cpudata, instead of allocating memory only for possible cpus.

This patch saves ram, allocating num_possible_cpus() (instead of NR_CPUS)
instances.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: "David S. Miller" <davem@davemloft.net>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Jens Axboe <axboe@suse.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Jens Axboe <axboe@suse.de>
Cc: Anton Blanchard <anton@samba.org>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric Dumazet 2006-03-23 03:01:04 -08:00 committed by Linus Torvalds
parent 5a6b7951bf
commit 63872f87a1
1 changed files with 8 additions and 3 deletions
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11
init/main.c
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@ -333,6 +333,7 @@ static void __init setup_per_cpu_areas(void)
{ {
unsigned long size, i; unsigned long size, i;
char *ptr; char *ptr;
unsigned long nr_possible_cpus = num_possible_cpus();
/* Copy section for each CPU (we discard the original) */ /* Copy section for each CPU (we discard the original) */
size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES); size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES);
@ -340,12 +341,16 @@ static void __init setup_per_cpu_areas(void)
if (size < PERCPU_ENOUGH_ROOM) if (size < PERCPU_ENOUGH_ROOM)
size = PERCPU_ENOUGH_ROOM; size = PERCPU_ENOUGH_ROOM;
#endif #endif
ptr = alloc_bootmem(size * nr_possible_cpus);
ptr = alloc_bootmem(size * NR_CPUS); for (i = 0; i < NR_CPUS; i++) {
if (!cpu_possible(i)) {
for (i = 0; i < NR_CPUS; i++, ptr += size) { __per_cpu_offset[i] = (char*)0 - __per_cpu_start;
continue;
}
__per_cpu_offset[i] = ptr - __per_cpu_start; __per_cpu_offset[i] = ptr - __per_cpu_start;
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
ptr += size;
} }
} }
#endif /* !__GENERIC_PER_CPU */ #endif /* !__GENERIC_PER_CPU */