[Crash-utility] display slabs in cpu partial list for slub

[Dave Anderson]

----- Original Message -----
> Hello Dave,
> 
> Please check this patch. It is used for slub to display slabs in
> kmem_cache_cpu.partial list.
> 
> I can only get it test on RHEL7.0GA right now. Would you please
> help get some other test? Thanks a lot.

Hello Qiao,

The patch seems to handle older and new kernel versions with CONFIG_SLUB,
although I don't have many dumpfiles that actually have any slabs queued
in the per-cpu PARTIAL lists.  But the ones that do, show them OK.

One question I have is why the "KMEM_CACHE_CPU" output has a separate
"CPU" column:

  CACHE            NAME                 OBJSIZE  ALLOCATED     TOTAL  SLABS  SSIZE
  ffff8800370b2500 tw_sock_TCPv6            200          0         0      0     8k
  KMEM_CACHE_CPU    CPU
  ffff88021fc18890    0
  CPU 0 SLAB:
    (empty)
  CPU 0 PARTIAL:
    (empty)
  KMEM_CACHE_CPU    CPU
  ffff88021fc58890    1
  CPU 1 SLAB:
    (empty)
  CPU 1 PARTIAL:
    (empty)
  KMEM_CACHE_CPU    CPU
  ffff88021fc98890    2
  CPU 2 SLAB:
    (empty)
  CPU 2 PARTIAL:
    (empty)
  ...

Why not display it like all of the other per-cpu items, e.g.,
showing something like this:

  CACHE            NAME                 OBJSIZE  ALLOCATED     TOTAL  SLABS  SSIZE
  ffff8800370b2500 tw_sock_TCPv6            200          0         0      0     8k
  CPU 0 KMEM_CACHE_CPU
  ffff88021fc18890
  CPU 0 SLAB:
    (empty)
  CPU 0 PARTIAL:
    (empty)
  CPU 1 KMEM_CACHE_CPU
  ffff88021fc58890
  CPU 1 SLAB:
    (empty)
  CPU 1 PARTIAL:
    (empty)
  CPU 2 KMEM_CACHE_CPU
  ffff88021fc98890
  CPU 2 SLAB:
    (empty)
  CPU 2 PARTIAL:
    (empty)

Thanks,
  Dave