linux-kernel - Re: [PATCH 42/46] perf script powerpc: Python script for hypervisor call statistics

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Date:   Thu, 7 Jun 2018 10:45:54 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Paul Clarke <pc@...ibm.com>
Cc:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Ingo Molnar <mingo@...nel.org>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Namhyung Kim <namhyung@...nel.org>,
        "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 42/46] perf script powerpc: Python script for hypervisor
 call statistics

Em Thu, Jun 07, 2018 at 08:41:46AM -0500, Paul Clarke escreveu:
> On 06/07/2018 12:34 AM, Ravi Bangoria wrote:
> > On 06/06/2018 08:23 PM, Paul Clarke wrote:
> >> On 06/05/2018 12:50 PM, Arnaldo Carvalho de Melo wrote:
> >>> From: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
> >>>
> >>> Add python script to show hypervisor call statistics. Ex,
> >>>
> >>>   # perf record -a -e "{powerpc:hcall_entry,powerpc:hcall_exit}"
> >>>   # perf script -s scripts/python/powerpc-hcalls.py
> >>>     hcall                            count   min(ns)   max(ns)   avg(ns)
> >>>     --------------------------------------------------------------------
> >>>     H_RANDOM                            82       838      1164       904
> >>>     H_PUT_TCE                           47      1078      5928      2003
> >>>     H_EOI                              266      1336      3546      1654
> >>>     H_ENTER                             28      1646      4038      1952
> >>>     H_PUT_TCE_INDIRECT                 230      2166     18168      6109
> >>>     H_IPI                              238      1072      3232      1688
> >>>     H_SEND_LOGICAL_LAN                  42      5488     21366      7694
> >>>     H_STUFF_TCE                        294       986      6210      3591
> >>>     H_XIRR                             266      2286      6990      3783
> >>>     H_PROTECT                           10      2196      3556      2555
> >>>     H_VIO_SIGNAL                       294      1028      2784      1311
> >>>     H_ADD_LOGICAL_LAN_BUFFER            53      1978      3450      2600
> >>>     H_SEND_CRQ                          77      1762      7240      2447
> >>
> >> This translation from HCALL code to mnemonic is more generally useful.  Is there a good way to make the "hcall_table_lookup" function more generally available, like "syscall_name" in scripts/python/Perf-Trace-Util/lib/Perf/Trace/Util.py ?  It's even simpler than the syscall ID-to-name mapping, because the HCALL codes are constant, unlike syscall IDs which vary between arches.
> >>
> > 
> > Right, but I don't see any other python script for hcalls. So, I thought
> > to add it in the script itself. Let me know if you are planning to add
> > any :) We will move it in a generic module.
 
> We're already doing the same thing in an external script.
> (https://github.com/open-power-sdk/curt/blob/master/curt.py#L264
> revision 107c97c3aadba3177bc8cf35b06ba165e6ac557f.)
 
> ...which reminds me that I should consider sending that script to
> linux-perf-users to see if it's interesting enough to be included
> upstream.

If you don't have any restriction, then its interesting to have it
included, I think, this way we can find these kinds of needed common
infrastructure more easily, and also when doing changes take into
account existing scripts.

- Arnaldo