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[PATCH] Only allocate percpu data for possible CPUs

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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 <[email protected]>
Acked-by: "David S. Miller" <[email protected]>
Cc: James Bottomley <[email protected]>
Cc: Jens Axboe <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Anton Blanchard <[email protected]>
Acked-by: William Irwin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Eric Dumazet 2006-03-23 03:01:04 -08:00 • committed by Linus Torvalds
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;
char *ptr;
unsigned long nr_possible_cpus = num_possible_cpus();
/* Copy section for each CPU (we discard the original) */
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)
size = PERCPU_ENOUGH_ROOM;
#endif
ptr = alloc_bootmem(size * nr_possible_cpus);
ptr = alloc_bootmem(size * NR_CPUS);
for (i = 0; i < NR_CPUS; i++, ptr += size) {
for (i = 0; i < NR_CPUS; i++) {
if (!cpu_possible(i)) {
__per_cpu_offset[i] = (char*)0 - __per_cpu_start;
continue;
}
__per_cpu_offset[i] = ptr - __per_cpu_start;
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
ptr += size;
}
}
#endif /* !__GENERIC_PER_CPU */