perf kmem: Implement stat --page --caller
It is 'perf kmem' support caller statistics for page. Unlike slab case, the tracepoints in page allocator don't provide callsite info. So it records with callchain and extracts callsite info. Note that the callchain contains several memory allocation functions which has no meaning for users. So skip those functions to get proper callsites. I used following regex pattern to skip the allocator functions: ^_?_?(alloc|get_free|get_zeroed)_pages? This gave me a following list of functions: # perf kmem record --page sleep 3 # perf kmem stat --page -v ... alloc func: __get_free_pages alloc func: get_zeroed_page alloc func: alloc_pages_exact alloc func: __alloc_pages_direct_compact alloc func: __alloc_pages_nodemask alloc func: alloc_page_interleave alloc func: alloc_pages_current alloc func: alloc_pages_vma alloc func: alloc_page_buffers alloc func: alloc_pages_exact_nid ... The output looks mostly same as --alloc (I also added callsite column to that) but groups entries by callsite. Currently, the order, migrate type and GFP flag info is for the last allocation and not guaranteed to be same for all allocations from the callsite. --------------------------------------------------------------------------------------------- Total_alloc (KB) | Hits | Order | Mig.type | GFP flags | Callsite --------------------------------------------------------------------------------------------- 1,064 | 266 | 0 | UNMOVABL | 000000d0 | __pollwait 52 | 13 | 0 | UNMOVABL | 002084d0 | pte_alloc_one 44 | 11 | 0 | MOVABLE | 000280da | handle_mm_fault 20 | 5 | 0 | MOVABLE | 000200da | do_cow_fault 20 | 5 | 0 | MOVABLE | 000200da | do_wp_page 16 | 4 | 0 | UNMOVABL | 000084d0 | __pmd_alloc 16 | 4 | 0 | UNMOVABL | 00000200 | __tlb_remove_page 12 | 3 | 0 | UNMOVABL | 000084d0 | __pud_alloc 8 | 2 | 0 | UNMOVABL | 00000010 | bio_copy_user_iov 4 | 1 | 0 | UNMOVABL | 000200d2 | pipe_write 4 | 1 | 0 | MOVABLE | 000280da | do_wp_page 4 | 1 | 0 | UNMOVABL | 002084d0 | pgd_alloc --------------------------------------------------------------------------------------------- Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Pekka Enberg <penberg@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Joonsoo Kim <js1304@gmail.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/1429592107-1807-2-git-send-email-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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