Re: [PATCH V5] Allow compaction of unevictable pages

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On 03/16/2015 02:49 PM, Eric B Munson wrote:
On Mon, 16 Mar 2015, Vlastimil Babka wrote:

[CC += linux-api@]

Since this is a kernel-user-space API change, please CC linux-api@.
The kernel source file Documentation/SubmitChecklist notes that all
Linux kernel patches that change userspace interfaces should be CCed
to linux-api@xxxxxxxxxxxxxxx, so that the various parties who are
interested in API changes are informed. For further information, see
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.kernel.org_doc_man-2Dpages_linux-2Dapi-2Dml.html&d=AwIC-g&c=96ZbZZcaMF4w0F4jpN6LZg&r=aUmMDRRT0nx4IfILbQLv8xzE0wB9sQxTHI3QrQ2lkBU&m=GUotTNnv26L0HxtXrBgiHqu6kwW3ufx2_TQpXIA216c&s=IFFYQ7Zr-4SIaF3slOZqiSP_noyva42kCwVRxxDm5wo&e=

Added to the Cc list, thanks.



On 03/13/2015 09:19 PM, Michal Hocko wrote:
On Fri 13-03-15 15:09:15, Eric B Munson wrote:
On Fri, 13 Mar 2015, Rik van Riel wrote:

On 03/13/2015 01:26 PM, Eric B Munson wrote:

--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1046,6 +1046,8 @@ typedef enum {
  	ISOLATE_SUCCESS,	/* Pages isolated, migrate */
  } isolate_migrate_t;

+int sysctl_compact_unevictable;

A comment here would be useful I think, as well as explicit default
value. Maybe also __read_mostly although I don't know how much that
matters.

I am going to sit on V6 for a couple of days incase anyone from rt wants
to chime in.  But these will be in V6.


I also wonder if it might be confusing that "compact_memory" is a
write-only trigger that doesn't even show under "sysctl -a", while
"compact_unevictable" is a read/write setting. But I don't have a
better suggestion right now.

Does allow_unevictable_compaction sound better?  It feels too much like

For sorting purposes, maybe compact_unevictable_allowed?

variable naming conventions from other languages which seems to
encourage verbosity to me, but does indicate a difference from
compact_memory.

If it sounds too awkward/long and nobody else has better suggestion, then just keep it as "compact_unevictable".

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