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SubjectRe: [PATCH 3/9] perf kmem: Analyze page allocator events also
Em Fri, Apr 10, 2015 at 06:06:29PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Apr 06, 2015 at 02:36:10PM +0900, Namhyung Kim escreveu:
> > The perf kmem command records and analyze kernel memory allocation
> > only for SLAB objects. This patch implement a simple page allocator
> > analyzer using kmem:mm_page_alloc and kmem:mm_page_free events.
> >
> > It adds two new options of --slab and --page. The --slab option is
> > for analyzing SLAB allocator and that's what perf kmem currently does.
> >
> > The new --page option enables page allocator events and analyze kernel
> > memory usage in page unit. Currently, 'stat --alloc' subcommand is
> > implemented only.
> >
> > If none of these --slab nor --page is specified, --slab is implied.
> >
> > # perf kmem stat --page --alloc --line 10
>
> Hi, applied the first patch, the kernel one, reboot with that kernel:

<SNIP>

> [root@ssdandy ~]#
>
> What am I missing?

Argh, I was expecting to read just what is in that cset and be able to
reproduce the results, had to go back to the [PATCH 0/0] cover letter to
figure out that I need to run:

perf kmem record --page sleep 5

With that I get:

[root@ssdandy ~]# perf kmem stat --page --alloc --line 20

--------------------------------------------------------------------------------
PFN | Total alloc (KB) | Hits | Order | Mig.type | GFP flags
--------------------------------------------------------------------------------
3487838 | 12 | 3 | 0 | UNMOVABL | 00020010
3493414 | 8 | 2 | 0 | UNMOVABL | 000284d0
3487761 | 4 | 1 | 0 | UNMOVABL | 000202d0
3487764 | 4 | 1 | 0 | UNMOVABL | 000202d0
3487982 | 4 | 1 | 0 | UNMOVABL | 000202d0
3487991 | 4 | 1 | 0 | UNMOVABL | 000284d0
3488046 | 4 | 1 | 0 | UNMOVABL | 002284d0
3488057 | 4 | 1 | 0 | UNMOVABL | 000200d0
3488191 | 4 | 1 | 0 | UNMOVABL | 002284d0
3488203 | 4 | 1 | 0 | UNMOVABL | 000202d0
3488206 | 4 | 1 | 0 | UNMOVABL | 000202d0
3488210 | 4 | 1 | 0 | UNMOVABL | 000202d0
3488211 | 4 | 1 | 0 | UNMOVABL | 000202d0
3488213 | 4 | 1 | 0 | UNMOVABL | 000202d0
3488215 | 4 | 1 | 0 | UNMOVABL | 000202d0
3488298 | 4 | 1 | 0 | UNMOVABL | 000202d0
3488325 | 4 | 1 | 0 | UNMOVABL | 000202d0
3488326 | 4 | 1 | 0 | UNMOVABL | 000202d0
3488327 | 4 | 1 | 0 | UNMOVABL | 000202d0
3488329 | 4 | 1 | 0 | UNMOVABL | 000202d0
... | ... | ... | ... | ... | ...
--------------------------------------------------------------------------------

SUMMARY (page allocator)
========================
Total allocation requests : 166 [ 664 KB ]
Total free requests : 239 [ 956 KB ]

Total alloc+freed requests : 49 [ 196 KB ]
Total alloc-only requests : 117 [ 468 KB ]
Total free-only requests : 190 [ 760 KB ]

Total allocation failures : 0 [ 0 KB ]

Order Unmovable Reclaimable Movable Reserved CMA/Isolated
----- ------------ ------------ ------------ ------------ ------------
0 143 . 23 . .
1 . . . . .
2 . . . . .
3 . . . . .
4 . . . . .
5 . . . . .
6 . . . . .
7 . . . . .
8 . . . . .
9 . . . . .
10 . . . . .
[root@ssdandy ~]#

- Arnaldo


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