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[PATCH] kdump: dynamic per cpu allocation of memory for saving cpu registers

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- In case of system crash, current state of cpu registers is saved in memory
  in elf note format.  So far memory for storing elf notes was being allocated
  statically for NR_CPUS.

- This patch introduces dynamic allocation of memory for storing elf notes.
  It uses alloc_percpu() interface.  This should lead to better memory usage.

- Introduced based on Andi Kleen's and Eric W. Biederman's suggestions.

- This patch also moves memory allocation for elf notes from architecture
  dependent portion to architecture independent portion.  Now crash_notes is
  architecture independent.  The whole idea is that size of memory to be
  allocated per cpu (MAX_NOTE_BYTES) can be architecture dependent and
  allocation of this memory can be architecture independent.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Vivek Goyal 2006-01-09 20:51:41 -08:00 • committed by Linus Torvalds
parent 8240941157
commit cc57165874
10 changed files with 21 additions and 24 deletions
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16
kernel/kexec.c
View file

@ -26,6 +26,9 @@
#include <asm/system.h>
#include <asm/semaphore.h>
/* Per cpu memory for storing cpu states in case of system crash. */
note_buf_t* crash_notes;
/* Location of the reserved area for the crash kernel */
struct resource crashk_res = {
.name = "Crash kernel",
@ -1060,3 +1063,16 @@ void crash_kexec(struct pt_regs *regs)
xchg(&kexec_lock, 0);
}
}
static int __init crash_notes_memory_init(void)
{
/* Allocate memory for saving cpu registers. */
crash_notes = alloc_percpu(note_buf_t);
if (!crash_notes) {
printk("Kexec: Memory allocation for saving cpu register"
" states failed\n");
return -ENOMEM;
}
return 0;
}
module_init(crash_notes_memory_init)