(Adding acme to CC.)
On Tue, Jan 22, 2013 at 11:46 AM, Ezequiel Garcia
<[email protected]> wrote:
> From: Ezequiel Garcia <[email protected]>
>
> The purpose of trace_analyze.py tool is to perform static
> and dynamic memory analysis using a kmem ftrace
> log file and a built kernel tree.
>
> This script and related work has been done on the CEWG/2012 project:
> "Kernel dynamic memory allocation tracking and reduction"
> (More info here [1])
>
> It produces mainly two kinds of outputs:
> * an account-like output, similar to the one given by Perf, example below.
> * a ring-char output, examples here [2].
>
> $ ./scripts/tracing/trace_analyze.py -k linux -f kmem.log --account-file
> account.txt
> $ ./scripts/tracing/trace_analyze.py -k linux -f kmem.log -c account.txt
>
> This will produce an account file like this:
>
> current bytes allocated: 669696
> current bytes requested: 618823
> current wasted bytes: 50873
> number of allocs: 7649
> number of frees: 2563
> number of callers: 115
>
> total waste net alloc/free caller
> ---------------------------------------------
> 299200 0 298928 1100/1 alloc_inode+0x4fL
> 189824 0 140544 1483/385 __d_alloc+0x22L
> 51904 0 47552 811/68 sysfs_new_dirent+0x4eL
> [...]
>
> [1] http://elinux.org/Kernel_dynamic_memory_analysis
> [2] http://elinux.org/Kernel_dynamic_memory_analysis#Current_dynamic_footprint
>
> Cc: Pekka Enberg <[email protected]>
> Cc: Steven Rostedt <[email protected]>
> Cc: Frederic Weisbecker <[email protected]>
> Cc: Ingo Molnar <[email protected]>
> Signed-off-by: Ezequiel Garcia <[email protected]>
Looks really useful! Dunno if this makes most sense as a separate
script or as an extension perf.
Pekka
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