From: Vivek Goyal <vgoyal@redhat.com>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Mike Snitzer <msnitzer@redhat.com>,
Laurence Oberman <loberman@redhat.com>,
Tao Ma <boyu.mt@taobao.com>, Robin Dong <sanbai@alibaba-inc.com>,
dm-devel@redhat.com, Coly Li <colyli@gmail.com>,
"Alasdair G. Kergon" <agk@redhat.com>
Subject: Re: [PATCH 2/4] dm stats: support precise timestamps
Date: Tue, 16 Jun 2015 11:33:45 -0400 [thread overview]
Message-ID: <20150616153345.GA1069@redhat.com> (raw)
In-Reply-To: <alpine.LRH.2.02.1506091721180.1545@file01.intranet.prod.int.rdu2.redhat.com>
On Tue, Jun 09, 2015 at 05:21:39PM -0400, Mikulas Patocka wrote:
[..]
> Messages
> ========
>
> - @stats_create <range> <step> [<program_id> [<aux_data>]]
> + @stats_create <range> <step>
> + [<number_of_optional_arguments> <optional_arguments>...]
> + [<program_id> [<aux_data>]]
>
> Create a new region and return the region_id.
>
> @@ -48,6 +54,17 @@ Messages
> "/<number_of_areas>" - the range is subdivided into the specified
> number of areas.
>
> + <number_of_optional_arguments>
> + The number of optional arguments
> +
> + <optional_arguments>
> + The following optional arguments are supported
> + precise_timestamps - use precise timer with nanosecond resolution
> + instead of the "jiffies" variable. When this argument is
> + used, the resulting times are in nanoseconds instead of
> + milliseconds. Precise timestamps are a little bit slower
> + to obtain than jiffies-based timestamps.
> +
Instead of "precise_timestams" will it make sense to call it
"nanosecond_timestamps" or "ns_timestamps".
> <program_id>
> An optional parameter. A name that uniquely identifies
> the userspace owner of the range. This groups ranges together
We are adding these new parameters/arguments in between existing parameters.
Will it break any of the existing scritps. Will it make sense to add these
new parameters at the end. It is more intuitive.
Also, I was wondering that why do we need to introduce this notion of
number of optional arguments. Can't we just introduce another optional
parameter [ns_timestamps]. That feels little simpler.
Thanks
Vivek
next prev parent reply other threads:[~2015-06-16 15:33 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-09 21:20 [PATCH 0/4] Integrate dm-latency functionality to dm-statistics Mikulas Patocka
2015-06-09 21:21 ` [PATCH 1/4] dm-statistics: better argument validation Mikulas Patocka
2015-06-09 21:21 ` [PATCH 2/4] dm stats: support precise timestamps Mikulas Patocka
2015-06-10 17:10 ` Mike Snitzer
2015-06-10 17:33 ` Mikulas Patocka
2015-06-10 17:40 ` Mike Snitzer
2015-06-13 17:03 ` Coly Li
2015-06-15 13:04 ` Mikulas Patocka
2015-06-15 14:17 ` Coly Li
2015-06-16 15:33 ` Vivek Goyal [this message]
2015-06-16 19:27 ` Mikulas Patocka
2015-06-17 1:43 ` Vivek Goyal
2015-06-17 13:17 ` Mikulas Patocka
2015-06-17 13:20 ` Vivek Goyal
2015-06-17 15:18 ` Bryn M. Reeves
2015-06-17 14:54 ` Bryn M. Reeves
2015-06-17 14:52 ` Bryn M. Reeves
2015-07-27 15:11 ` Bryn M. Reeves
2015-06-09 21:22 ` [PATCH 3/4] dm stats: report histogram of latencies Mikulas Patocka
2015-06-13 17:03 ` Coly Li
2015-06-15 13:06 ` Mikulas Patocka
2015-06-15 14:41 ` Coly Li
2015-06-15 15:34 ` Mikulas Patocka
2015-06-16 16:21 ` Vivek Goyal
2015-06-09 21:22 ` [PATCH 4/4] dm stats: support statistics on requests-based devices Mikulas Patocka
2015-06-09 21:23 ` Laurence Oberman
2015-06-13 17:02 ` [PATCH 0/4] Integrate dm-latency functionality to dm-statistics Coly Li
2015-06-15 12:47 ` Mikulas Patocka
2015-06-15 14:35 ` Coly Li
2015-06-17 13:22 ` Mikulas Patocka
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