From: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
To: Ming Lei <ming.lei@redhat.com>
Cc: axboe@kernel.dk, linux-block@vger.kernel.org,
Florian-Ewald Mueller <florian-ewald.mueller@cloud.ionos.com>
Subject: Re: [PATCH RFC 4/5] block: add a statistic table for io latency
Date: Wed, 8 Jul 2020 16:06:57 +0200 [thread overview]
Message-ID: <b37dd9cd-aebc-88ee-2b09-ac4eb36ca0f7@cloud.ionos.com> (raw)
In-Reply-To: <eb2cf4d0-4260-8f10-0ba9-3cbf4ff85449@cloud.ionos.com>
On 7/8/20 4:02 PM, Guoqing Jiang wrote:
>> Hi Guoqing,
>>
>> I believe it isn't hard to write a ebpf based script(bcc or bpftrace) to
>> collect this kind of performance data, so looks not necessary to do it
>> in kernel.
>
> Hi Ming,
>
> Sorry, I don't know well about bcc or bpftrace, but I assume they need to
> read the latency value from somewhere inside kernel. Could you point
> how can I get the latency value? Thanks in advance!
Hmm, I suppose biolatency is suitable for track latency, will look into it.
Thanks,
Guoqing
next prev parent reply other threads:[~2020-07-08 14:07 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-08 7:58 [RFC PATCH 0/4] block: add two statistic tables Guoqing Jiang
2020-07-08 7:58 ` [PATCH RFC 1/5] block: return ns precision from disk_start_io_acct Guoqing Jiang
2020-07-08 13:27 ` Ming Lei
2020-07-08 13:53 ` Guoqing Jiang
2020-07-08 17:46 ` Guoqing Jiang
2020-07-08 7:58 ` [PATCH RFC 2/5] drbd: remove unused argument from drbd_request_prepare and __drbd_make_request Guoqing Jiang
2020-07-08 7:58 ` [PATCH RFC 3/5] drbd: rename start_jif to start_ns Guoqing Jiang
2020-07-08 7:58 ` [PATCH RFC 4/5] block: add a statistic table for io latency Guoqing Jiang
2020-07-08 13:29 ` Ming Lei
2020-07-08 14:02 ` Guoqing Jiang
2020-07-08 14:06 ` Guoqing Jiang [this message]
2020-07-09 18:48 ` Guoqing Jiang
2020-07-10 0:53 ` Ming Lei
2020-07-10 8:55 ` Guoqing Jiang
2020-07-10 10:00 ` Ming Lei
2020-07-10 10:29 ` Guoqing Jiang
2020-07-11 1:32 ` Ming Lei
2020-07-12 20:39 ` Guoqing Jiang
2020-07-12 20:44 ` Jens Axboe
2020-07-12 21:04 ` Guoqing Jiang
2020-07-10 14:04 ` Jens Axboe
2020-07-08 7:58 ` [PATCH RFC 5/5] block: add a statistic table for io sector Guoqing Jiang
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