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authorVivek Goyal <vgoyal@in.ibm.com>2006-01-09 23:51:41 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-10 11:01:26 -0500
commitcc57165874e938ef684d71ba7d36e7088b551489 (patch)
treee1847f5547a7a426214e9ef0719eab908ee305d7 /kernel
parent82409411571ad89d271dc46f7fa26149fad9efdf (diff)
[PATCH] kdump: dynamic per cpu allocation of memory for saving cpu registers
- 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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/kexec.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 2c95848fbce8..1197de8b2a94 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -26,6 +26,9 @@
26#include <asm/system.h> 26#include <asm/system.h>
27#include <asm/semaphore.h> 27#include <asm/semaphore.h>
28 28
29/* Per cpu memory for storing cpu states in case of system crash. */
30note_buf_t* crash_notes;
31
29/* Location of the reserved area for the crash kernel */ 32/* Location of the reserved area for the crash kernel */
30struct resource crashk_res = { 33struct resource crashk_res = {
31 .name = "Crash kernel", 34 .name = "Crash kernel",
@@ -1060,3 +1063,16 @@ void crash_kexec(struct pt_regs *regs)
1060 xchg(&kexec_lock, 0); 1063 xchg(&kexec_lock, 0);
1061 } 1064 }
1062} 1065}
1066
1067static int __init crash_notes_memory_init(void)
1068{
1069 /* Allocate memory for saving cpu registers. */
1070 crash_notes = alloc_percpu(note_buf_t);
1071 if (!crash_notes) {
1072 printk("Kexec: Memory allocation for saving cpu register"
1073 " states failed\n");
1074 return -ENOMEM;
1075 }
1076 return 0;
1077}
1078module_init(crash_notes_memory_init)