linux-kernel - Re: [PATCH] mm: hide per-cpu lists in output of show

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Message-Id: <20150220134541.772f0c302a50f115b280917f@linux-foundation.org>
Date:	Fri, 20 Feb 2015 13:45:41 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: hide per-cpu lists in output of show_mem()

On Fri, 20 Feb 2015 17:39:42 +0300 Konstantin Khlebnikov <khlebnikov@...dex-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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