• V
    [PATCH] kdump: dynamic per cpu allocation of memory for saving cpu registers · cc571658
    Vivek Goyal 提交于
    - 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: NVivek Goyal <vgoyal@in.ibm.com>
    Signed-off-by: NAndrew Morton <akpm@osdl.org>
    Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
    cc571658
kexec.c 27.5 KB