Re: [PATCH] mm: hide per-cpu lists in output of show_mem()

[Andrew Morton <akpm@linux-foundation.org>]

On Fri, 20 Feb 2015 17:39:42 +0300 Konstantin Khlebnikov <khlebnikov@yandex-team.ru> wrote:

> This makes show_mem() much less verbose at huge machines. Instead of
> huge and almost useless dump of counters for each per-zone per-cpu
> lists this patch prints sum of these counters for each zone (free_pcp)
> and size of per-cpu list for current cpu (local_pcp).
> 
> Flag SHOW_MEM_PERCPU_LISTS reverts old verbose mode.

Forgot to update the comment:

--- a/mm/page_alloc.c~mm-hide-per-cpu-lists-in-output-of-show_mem-fix
+++ a/mm/page_alloc.c
@@ -3243,8 +3243,11 @@ static void show_migration_types(unsigne
  * Show free area list (used inside shift_scroll-lock stuff)
  * We also calculate the percentage fragmentation. We do this by counting the
  * memory on each free list with the exception of the first item on the list.
- * Suppresses nodes that are not allowed by current's cpuset if
- * SHOW_MEM_FILTER_NODES is passed.
+ *
+ * Bits in @filter:
+ * SHOW_MEM_FILTER_NODES: suppress nodes that are not allowed by current's
+ *   cpuset.
+ * SHOW_MEM_PERCPU_LISTS: display full per-node per-cpu pcp lists
  */
 void show_free_areas(unsigned int filter)
 {


Is there really any point in having SHOW_MEM_PERCPU_LISTS?  There isn't
presently a way of setting it(?).

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