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From: Jens Axboe <axboe@fb.com>
To: Omar Sandoval <osandov@osandov.com>
Cc: <axboe@kernel.dk>, <linux-kernel@vger.kernel.org>,
	<linux-fsdevel@vger.kernel.org>, <linux-block@vger.kernel.org>
Subject: Re: [PATCH 7/8] wbt: add general throttling mechanism
Date: Thu, 1 Sep 2016 12:51:49 -0600
Message-ID: <b983e71b-c959-ca43-ce7b-b234db6035fa@fb.com> (raw)
In-Reply-To: <20160901180523.GA3280@vader.DHCP.thefacebook.com>

On 09/01/2016 12:05 PM, Omar Sandoval wrote:
>> diff --git a/lib/Kconfig b/lib/Kconfig
>> index d79909dc01ec..5a65a1f91889 100644
>> --- a/lib/Kconfig
>> +++ b/lib/Kconfig
>> @@ -550,4 +550,8 @@ config STACKDEPOT
>>  	bool
>>  	select STACKTRACE
>>
>> +config WBT
>> +	bool
>> +	select SCALE_BITMAP
>
> Looks like this snuck in from your experiments to get this to work on
> top of scale_bitmap?

Oops yes, it is indeed. Killed, thanks.

>> +	if (waitqueue_active(&rwb->wait)) {
>> +		int diff = limit - inflight;
>> +
>> +		if (!inflight || diff >= rwb->wb_background / 2)
>> +			wake_up_nr(&rwb->wait, 1);
>
> wake_up(&rwb->wait)?

Yeah, that'd be cleaner. I think this is a leftover from when I 
experimented with batched wakeups, with nr != 1. I'll change it to just 
wake_up().

-- 
Jens Axboe

  reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-31 17:05 [PATCHSET v6] Throttled background buffered writeback Jens Axboe
2016-08-31 17:05 ` [PATCH 1/8] block: add WRITE_BG Jens Axboe
2016-09-01  7:55   ` Johannes Thumshirn
2016-09-01  7:59     ` Johannes Thumshirn
2016-08-31 17:05 ` [PATCH 2/8] writeback: add wbc_to_write_flags() Jens Axboe
2016-08-31 23:32   ` Omar Sandoval
2016-09-01  3:54     ` Jens Axboe
2016-08-31 17:05 ` [PATCH 3/8] writeback: use WRITE_BG for kupdate and background writeback Jens Axboe
2016-08-31 17:05 ` [PATCH 4/8] writeback: track if we're sleeping on progress in balance_dirty_pages() Jens Axboe
2016-08-31 17:05 ` [PATCH 5/8] block: add code to track actual device queue depth Jens Axboe
2016-08-31 17:05 ` [PATCH 6/8] block: add scalable completion tracking of requests Jens Axboe
2016-08-31 17:05 ` [PATCH 7/8] wbt: add general throttling mechanism Jens Axboe
2016-09-01 18:05   ` Omar Sandoval
2016-09-01 18:51     ` Jens Axboe [this message]
2016-08-31 17:05 ` [PATCH 8/8] writeback: throttle buffered writeback Jens Axboe
  -- strict thread matches above, loose matches on Subject: below --
2016-09-07 14:46 [PATCH 0/8] Throttled background buffered writeback v7 Jens Axboe
2016-09-07 14:46 ` [PATCH 7/8] wbt: add general throttling mechanism Jens Axboe
2016-04-26 15:55 [PATCHSET v5] Make background writeback great again for the first time Jens Axboe
2016-04-26 15:55 ` [PATCH 7/8] wbt: add general throttling mechanism Jens Axboe
2016-04-27 12:06   ` xiakaixu
2016-04-27 15:21     ` Jens Axboe
2016-04-28  3:29       ` xiakaixu
2016-04-28 11:05   ` Jan Kara
2016-04-28 18:53     ` Jens Axboe
2016-04-28 19:03       ` Jens Axboe
2016-05-03  9:34       ` Jan Kara
2016-05-03 14:23         ` Jens Axboe
2016-05-03 15:22           ` Jan Kara
2016-05-03 15:32             ` Jens Axboe
2016-05-03 15:40         ` Jan Kara
2016-05-03 15:48           ` Jan Kara
2016-05-03 16:59             ` Jens Axboe
2016-05-03 18:14               ` Jens Axboe
2016-05-03 19:07                 ` Jens Axboe

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