On Wed, Sep 29, 2010 at 6:36 PM, Corey Ashford
<cjash...@linux.vnet.ibm.com> wrote:
> On 09/29/2010 12:33 AM, stephane eranian wrote:
>>
>> Corey,
>>
>> Please note that once libpfm4-1.0 is released, I'll post a patch
>> to link the perf tool directly with libpfm4. At that point, you will
>> not need your little evt2raw program to access any event encoding.
>
> When you say you'll post a patch, did you mean to LKML? I did this already
> and it was rejected in favor of a more long-term approach that uses sysfs
> for PMU and event naming. All of the details of that system are still very
> sketchy, but I don't think you'll be able to get Ingo et al. to commit such
> a patch.
>
I don't want to have the full event tables in the kernel. There are about
100 events on any Intel processors. No way this should go into the
kernel. I am not event talking about the modifiers or umask combinations.
>>
>> What's blocking release 1.0?
>>
>> 1- add support for OS-specific event attributes
>> 2- add Pentium 4 (Netburst) support
>>
>> For 1, the idea is to allow you to pass attributes which come from the
>> OS API and not the HW. For instance, the sampling period, the precise_ip
>> mode. The list of OS attributes for each event depends on the OS and the
>> event itself. Sometimes, there are several HW attributes which do overlap
>> with OS attributes, for instance u, k, precise_ip. The latter is connected
>> to
>> PEBS on Intel processors. The u, k in perf_events override those set in
>> HW.
>>
>> The reason 1- is delaying the release is because it may have some
>> implications
>> at the user level API of libpfm4.
>>
>
> That's interesting, and I can see where that would have use for us as well.
> For example, some of our Power-based systems have full hypervisors and some
> run the Linux kernel in hypervisor mode.
>
Well, yes, I want to get to a situation where I can say:
perf stat -e inst_retired:any_p:c=1:i:u:F=1000:precise=2
Yes, the core of the library should remain OS-API agnostic.
Thus it has to also export what the HW can do, e.g., user or
kernel priv levels. So there are some nasty corner cases where
modifiers from the HW and OS collide. This has to be handled
properly. I also want to be able to connect libpfm4 to non perf_event
based OS, e.g., FreeBSD, Win32, and so on.
> - Corey
>>
>> On Wed, Sep 29, 2010 at 9:27 AM, stephane eranian
>> <eran...@googlemail.com> wrote:
>>>
>>> Corey,
>>>
>>> Patch applied. I tweaked the error messages a bit.
>>> Thanks.
>>>
>>> On Mon, Sep 27, 2010 at 8:15 AM, Corey Ashford
>>> <cjash...@linux.vnet.ibm.com> wrote:
>>>>
>>>> Provide a small tool which translates an event string + modifiers to a
>>>> raw
>>>> event code for use with the perf tool.
>>>>
>>>> This example is very simple and takes a single event string as an
>>>> argument.
>>>>
>>>> Signed-off-by: Corey Ashford<cjash...@us.ibm.com>
>>>> ---
>>>> perf_examples/Makefile | 2 +-
>>>> perf_examples/evt2raw.c | 74
>>>> +++++++++++++++++++++++++++++++++++++++++++++++
>>>> 2 files changed, 75 insertions(+), 1 deletions(-)
>>>> create mode 100644 perf_examples/evt2raw.c
>>>>
>>>> diff --git a/perf_examples/Makefile b/perf_examples/Makefile
>>>> index 1d353d4..8ebb290 100644
>>>> --- a/perf_examples/Makefile
>>>> +++ b/perf_examples/Makefile
>>>> @@ -55,7 +55,7 @@ ifeq ($(SYS),Linux)
>>>> LPC_UTILS=perf_util.o
>>>> TARGETS+=self self_basic self_count task task_attach_timeout syst \
>>>> notify_self notify_group task_smpl self_smpl_multi \
>>>> - self_pipe syst_count task_cpu syst_smpl
>>>> + self_pipe syst_count task_cpu syst_smpl evt2raw
>>>>
>>>> #XTRA += rtop
>>>> endif
>>>> diff --git a/perf_examples/evt2raw.c b/perf_examples/evt2raw.c
>>>> new file mode 100644
>>>> index 0000000..917420f
>>>> --- /dev/null
>>>> +++ b/perf_examples/evt2raw.c
>>>> @@ -0,0 +1,74 @@
>>>> +/*
>>>> + * evt2raw.c - example which converts an event string (event +
>>>> modifiers) to
>>>> + * a raw event code usable by the perf tool.
>>>> + *
>>>> + * Copyright (c) 2010 IBM Corp.
>>>> + * Contributed by Corey Ashford<cjash...@us.ibm.com>
>>>> + *
>>>> + * Permission is hereby granted, free of charge, to any person
>>>> obtaining a copy
>>>> + * of this software and associated documentation files (the
>>>> "Software"), to deal
>>>> + * in the Software without restriction, including without limitation
>>>> the rights
>>>> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or
>>>> sell copies
>>>> + * of the Software, and to permit persons to whom the Software is
>>>> furnished to do so,
>>>> + * subject to the following conditions:
>>>> + *
>>>> + * The above copyright notice and this permission notice shall be
>>>> included in all
>>>> + * copies or substantial portions of the Software.
>>>> + *
>>>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
>>>> EXPRESS OR IMPLIED,
>>>> + * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
>>>> FITNESS FOR A
>>>> + * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
>>>> AUTHORS OR COPYRIGHT
>>>> + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
>>>> IN AN ACTION OF
>>>> + * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
>>>> WITH THE SOFTWARE
>>>> + * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
>>>> + */
>>>> +#include<stdio.h>
>>>> +#include<stdlib.h>
>>>> +#include<unistd.h>
>>>> +#include<perfmon/pfmlib_perf_event.h>
>>>> +
>>>> +static void
>>>> +usage(void)
>>>> +{
>>>> + printf("usage: evt2raw<event>\n"
>>>> + "<event> is the symbolic event, including modifiers, to
>>>> "
>>>> + "translate to a raw code.\n");
>>>> +}
>>>> +
>>>> +int
>>>> +main(int argc, char **argv)
>>>> +{
>>>> + int ret;
>>>> + struct perf_event_attr pea;
>>>> + char *event_str;
>>>> +
>>>> + if (argc != 2) {
>>>> + usage();
>>>> + return 1;
>>>> + }
>>>> + event_str = argv[1];
>>>> +
>>>> + ret = pfm_initialize();
>>>> + if (ret != PFM_SUCCESS) {
>>>> + printf("Internal error: pfm_initialize returned %s\n",
>>>> + pfm_strerror(ret));
>>>> + return 1;
>>>> + }
>>>> +
>>>> + ret = pfm_get_perf_event_encoding(event_str,
>>>> PFM_PLM0|PFM_PLM3,&pea,
>>>> + NULL, NULL);
>>>> + if (ret != PFM_SUCCESS) {
>>>> + printf("Error: pfm_get_perf_encoding returned %s\n",
>>>> + pfm_strerror(ret));
>>>> + return 1;
>>>> + }
>>>> +
>>>> + if (pea.type != PERF_TYPE_RAW) {
>>>> + printf("Error: %s is not a raw hardware event\n",
>>>> event_str);
>>>> + return 1;
>>>> + }
>>>> +
>>>> + printf("r%llx\n", pea.config);
>>>> +
>>>> + return 0;
>>>> +}
>>>> --
>>>> 1.7.0.4
>>>>
>>>>
>>>>
>>>> ------------------------------------------------------------------------------
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>>>> and start using them to simplify application deployment and
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>>>>
>>>
>
>
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