From: pi3orama <pi3orama@163.com>
To: Nilay Vaish <nilayvaish@gmail.com>
Cc: Wang Nan <wangnan0@huawei.com>,
acme@kernel.org, Linux Kernel list <linux-kernel@vger.kernel.org>,
He Kuang <hekuang@huawei.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Jiri Olsa <jolsa@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Namhyung Kim <namhyung@kernel.org>, Zefan Li <lizefan@huawei.com>
Subject: Re: [PATCH v10 07/10] perf record: Read from overwritable ring buffer
Date: Thu, 23 Jun 2016 22:31:39 +0800 [thread overview]
Message-ID: <28A97E4D-3B8D-4151-8F94-627629E89263@163.com> (raw)
In-Reply-To: <CACbG30-YC1AN43mtkZbuyAq0YiE9YBknbhXRrYO7TYn3SoQFPw@mail.gmail.com>
发自我的 iPhone
> 在 2016年6月23日,下午10:27,Nilay Vaish <nilayvaish@gmail.com> 写道:
>
>> On 23 June 2016 at 00:27, Wang Nan <wangnan0@huawei.com> wrote:
>> @@ -542,6 +568,79 @@ static struct perf_event_header finished_round_event = {
>> .type = PERF_RECORD_FINISHED_ROUND,
>> };
>>
>> +static void
>> +record__toggle_overwrite_evsels(struct record *rec,
>> + enum overwrite_evt_state state)
>> +{
>> + struct perf_evlist *evlist = rec->overwrite_evlist;
>> + enum overwrite_evt_state old_state = rec->overwrite_evt_state;
>> + enum action {
>> + NONE,
>> + PAUSE,
>> + RESUME,
>> + } action = NONE;
>> +
>> + switch (old_state) {
>> + case OVERWRITE_EVT_RUNNING: {
>> + switch (state) {
>> + case OVERWRITE_EVT_DATA_PENDING:
>> + action = PAUSE;
>> + break;
>> + case OVERWRITE_EVT_RUNNING:
>> + case OVERWRITE_EVT_EMPTY:
>> + default:
>> + goto state_err;
>> + }
>> + break;
>> + }
>> + case OVERWRITE_EVT_DATA_PENDING: {
>> + switch (state) {
>> + case OVERWRITE_EVT_EMPTY:
>> + break;
>> + case OVERWRITE_EVT_RUNNING:
>> + case OVERWRITE_EVT_DATA_PENDING:
>> + default:
>> + goto state_err;
>> + }
>> + break;
>> + }
>> + case OVERWRITE_EVT_EMPTY: {
>> + switch (state) {
>> + case OVERWRITE_EVT_RUNNING:
>> + action = RESUME;
>> + break;
>> + case OVERWRITE_EVT_EMPTY:
>> + case OVERWRITE_EVT_DATA_PENDING:
>> + default:
>> + goto state_err;
>
>
> Wang, thanks for making the changes I suggested.
> The patch overall looks fine to me. Just as a matter
> of style, I probably would not write case labels that
> do not have any statements associated with them.
> I'll let default take care of those labels.
>
I don't like them either.
You have to do this when you start working
on perf code. It turns on -Wall and -Werror,
without these case gcc will complain,
compiling will fail.
Thank you.
> --
> Nilay
next prev parent reply other threads:[~2016-06-23 14:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-23 5:27 [PATCH v10 00/10] perf tools: Support overwritable ring buffer Wang Nan
2016-06-23 5:27 ` [PATCH v10 01/10] perf record: Prepare mmap multiple evlists Wang Nan
2016-06-23 5:27 ` [PATCH v10 02/10] perf record: Prepare reading from multiple evlists in record__mmap_read_all() Wang Nan
2016-06-23 5:27 ` [PATCH v10 03/10] perf record: Prepare picking perf_event_mmap_page from multiple evlists Wang Nan
2016-06-23 5:27 ` [PATCH v10 04/10] perf evlist: Introduce aux evlist Wang Nan
2016-06-23 14:15 ` Nilay Vaish
2016-06-23 5:27 ` [PATCH v10 05/10] perf tests: Add testcase for auxiliary evlist Wang Nan
2016-06-23 5:27 ` [PATCH v10 06/10] perf record: Introduce rec->overwrite_evlist for overwritable events Wang Nan
2016-06-23 5:27 ` [PATCH v10 07/10] perf record: Read from overwritable ring buffer Wang Nan
2016-06-23 14:27 ` Nilay Vaish
2016-06-23 14:31 ` pi3orama [this message]
2016-06-23 17:38 ` Nilay Vaish
2016-06-23 5:27 ` [PATCH v10 08/10] perf tools: Enable overwrite settings Wang Nan
2016-06-23 5:27 ` [PATCH v10 09/10] perf tools: Don't warn about out of order event if write_backward is used Wang Nan
2016-06-23 5:27 ` [PATCH v10 10/10] perf tools: Add --tail-synthesize option Wang Nan
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