memory usage between kernel versions

[valdis.kletnieks at vt.edu]

On Tue, 14 Nov 2017 09:42:33 -0800, Mike Harless said:

> 3.14 kernel:
> 4c010000-4c0d0000 r-xp 00000000 00:0e 1177 /lib/libc-2.20-2014.11.so
> Size:                768 kB
> Rss:                 416 kB
> Pss:                  12 kB
>
> 4.9 kernel:
> 4c010000-4c0d0000 r-xp 00000000 00:0e 1177 /lib/libc-2.20-2014.11.so
> Size:                768 kB
> Rss:                 768 kB
> Pss:                  12 kB
>
> Is this difference in Rss something to keep looking into, or are there
> other thoughts or suggestions on where to look?  Thanks!

Looks identical to me except for the RSS - which is the amount of resident
memory consumed. And *that* can be an artifact of when the process was started,
what order processes were started, how many of its pages had been referenced,
whether the kernel does read-ahead of .so text segments, and any number of
other things.  It may be as simple as "you checked the 3.14 system when it had
been up for several days/weeks/months and all the useless parts of libc had
been freed (to be re-fetched from disk if referenced), and you checked the
bright shiny new 4.9 kernel right after boot, before memory pressure had caused
page frees to happen.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 486 bytes
Desc: not available
Url : http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20171114/a001f6d5/attachment.bin