From: Hongchen Zhang <zhanghongchen@loongson.cn>
To: Luis Chamberlain <mcgrof@kernel.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Kuniyuki Iwashima <kuniyu@amazon.co.jp>,
David Howells <dhowells@redhat.com>,
Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
Randy Dunlap <rdunlap@infradead.org>,
Eric Dumazet <edumazet@google.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] pipe: use __pipe_{lock,unlock} instead of spinlock
Date: Sat, 7 Jan 2023 08:58:10 +0800 [thread overview]
Message-ID: <9da36d2c-2229-08a4-d78f-e789b93132b1@loongson.cn> (raw)
In-Reply-To: <Y7hyw+fTdgAF6uYP@bombadil.infradead.org>
Hi Luis,
On 2023/1/7 上午3:13, Luis Chamberlain wrote:
> On Fri, Jan 06, 2023 at 05:48:44PM +0800, Hongchen Zhang wrote:
>> Use spinlock in pipe_read/write cost too much time,IMO
>> pipe->{head,tail} can be protected by __pipe_{lock,unlock}.
>> On the other hand, we can use __pipe_{lock,unlock} to protect
>> the pipe->{head,tail} in pipe_resize_ring and
>> post_one_notification.
>>
>> I tested this patch using UnixBench's pipe test case on a x86_64
>> machine,and get the following data:
>> 1) before this patch
>> System Benchmarks Partial Index BASELINE RESULT INDEX
>> Pipe Throughput 12440.0 493023.3 396.3
>> ========
>> System Benchmarks Index Score (Partial Only) 396.3
>>
>> 2) after this patch
>> System Benchmarks Partial Index BASELINE RESULT INDEX
>> Pipe Throughput 12440.0 507551.4 408.0
>> ========
>> System Benchmarks Index Score (Partial Only) 408.0
>>
>> so we get ~3% speedup.
>>
>> Signed-off-by: Hongchen Zhang <zhanghongchen@loongson.cn>
>> ---
>
> After the above "---" line you should have the changlog descrption.
> For instance:
>
> v3:
> - fixes bleh blah blah
> v2:
> - fixes 0-day report by ... etc..
> - fixes spelling or whatever
>
> I cannot decipher what you did here differently, not do I want to go
> looking and diff'ing. So you are making the life of reviewer harder.
>
> Luis
>
Matthew also reminded me to add the change log, but I don't think it is
necessary to write the change log to fix the errors in the patch.
Anyway, I think it is a good habit and will add these contents in the
new v3 version.
Best Regards,
Hongchen Zhang
next prev parent reply other threads:[~2023-01-07 0:59 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-06 9:48 [PATCH v3] pipe: use __pipe_{lock,unlock} instead of spinlock Hongchen Zhang
2023-01-06 19:13 ` Luis Chamberlain
2023-01-06 20:33 ` Sedat Dilek
2023-01-07 3:31 ` Hongchen Zhang
2023-01-07 0:58 ` Hongchen Zhang [this message]
-- strict thread matches above, loose matches on Subject: below --
2023-01-07 1:23 Hongchen Zhang
2023-01-13 3:19 ` Hongchen Zhang
2023-01-13 9:32 ` Sedat Dilek
2023-01-16 1:52 ` Sedat Dilek
2023-01-16 2:16 ` Hongchen Zhang
2023-01-16 2:42 ` Sedat Dilek
2023-01-16 3:16 ` maobibo
2023-01-16 4:38 ` Matthew Wilcox
2023-01-16 21:10 ` Al Viro
2023-01-16 22:16 ` Andrew Morton
2023-01-17 6:54 ` Sedat Dilek
2023-01-29 2:29 ` Hongchen Zhang
2023-01-06 9:28 Hongchen Zhang
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