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SubjectRe: [PATCH 3/9] perf kmem: Analyze page allocator events also
Hi Arnaldo,

On Fri, Apr 10, 2015 at 06:10:49PM -0300, Arnaldo Carvalho de Melo wrote:
> 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

Right. Maybe I need to change to print warning if no events found
with option.


>
> 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
> ... | ... | ... | ... | ... | ...
> --------------------------------------------------------------------------------

Hmm.. looks like you ran some old version. Please check v6! :)

Thanks,
Namhyung


>
> 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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