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SubjectRe: [PATCH 2/5] perf kmem: Analyze page allocator events also
From
2015-03-23 15:30 GMT+09:00 Namhyung Kim <namhyung@kernel.org>:
> 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
>
> -------------------------------------------------------------------------------------
> Page | Total alloc (KB) | Hits | Order | Migration type | GFP flags
> -------------------------------------------------------------------------------------
> ffffea0015e48e00 | 16 | 1 | 2 | RECLAIMABLE | 00285250
> ffffea0015e47400 | 16 | 1 | 2 | RECLAIMABLE | 00285250
> ffffea001440f600 | 16 | 1 | 2 | RECLAIMABLE | 00285250
> ffffea001440cc00 | 16 | 1 | 2 | RECLAIMABLE | 00285250
> ffffea00140c6300 | 16 | 1 | 2 | RECLAIMABLE | 00285250
> ffffea00140c5c00 | 16 | 1 | 2 | RECLAIMABLE | 00285250
> ffffea00140c5000 | 16 | 1 | 2 | RECLAIMABLE | 00285250
> ffffea00140c4f00 | 16 | 1 | 2 | RECLAIMABLE | 00285250
> ffffea00140c4e00 | 16 | 1 | 2 | RECLAIMABLE | 00285250
> ffffea00140c4d00 | 16 | 1 | 2 | RECLAIMABLE | 00285250
> ... | ... | ... | ... | ... | ...
> -------------------------------------------------------------------------------------

Tracepoint on mm_page_alloc print out pfn as well as pointer of struct page.
How about printing pfn rather than pointer of struct page?

Thanks.


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