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From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
	Joey Pabalinas <joeypabalinas@gmail.com>
Subject: Re: [PATCH v4 7/7] zram: writeback throttle
Date: Mon, 3 Dec 2018 14:50:26 +0900	[thread overview]
Message-ID: <20181203055026.GD427@jagdpanzerIV> (raw)
In-Reply-To: <20181203024045.153534-8-minchan@kernel.org>

On (12/03/18 11:40), Minchan Kim wrote:
[..]
> +	down_read(&zram->init_lock);
> +	atomic64_set(&zram->stats.bd_wb_limit, val);
> +	if (val == 0)
> +		zram->stop_writeback = false;
> +	up_read(&zram->init_lock);

[..]

> +		if (zram->stop_writeback) {
> +			ret = -EIO;
> +			break;
> +		}
> +
>  		if (!blk_idx) {
>  			blk_idx = alloc_block_bdev(zram);
>  			if (!blk_idx) {
> @@ -694,6 +732,11 @@ static ssize_t writeback_store(struct device *dev,
>  		zram_set_element(zram, index, blk_idx);
>  		blk_idx = 0;
>  		atomic64_inc(&zram->stats.pages_stored);
> +		if (atomic64_add_unless(&zram->stats.bd_wb_limit,
> +					-1 << (PAGE_SHIFT - 12), 0)) {
> +			if (atomic64_read(&zram->stats.bd_wb_limit) == 0)
> +				zram->stop_writeback = true;
> +		}

Do we need ->stop_writeback? It should be identical to

	atomic64_read(&zram->stats.bd_wb_limit) == 0


Otherwise, looks good!

	-ss

  reply	other threads:[~2018-12-03  5:50 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-03  2:40 [PATCH v4 0/7] zram idle page writeback Minchan Kim
2018-12-03  2:40 ` [PATCH v4 1/7] zram: fix lockdep warning of free block handling Minchan Kim
2018-12-03  2:40 ` [PATCH v4 2/7] zram: fix double free backing device Minchan Kim
2018-12-03  2:40 ` [PATCH v4 3/7] zram: refactoring flags and writeback stuff Minchan Kim
2018-12-03  2:40 ` [PATCH v4 4/7] zram: introduce ZRAM_IDLE flag Minchan Kim
2018-12-03  2:40 ` [PATCH v4 5/7] zram: support idle/huge page writeback Minchan Kim
2018-12-03  2:40 ` [PATCH v4 6/7] zram: add bd_stat statistics Minchan Kim
2018-12-03  2:40 ` [PATCH v4 7/7] zram: writeback throttle Minchan Kim
2018-12-03  5:50   ` Sergey Senozhatsky [this message]
2018-12-03  6:02     ` Sergey Senozhatsky
2018-12-03  6:11       ` Sergey Senozhatsky
2018-12-04  2:08 ` [PATCH v4 0/7] zram idle page writeback Sergey Senozhatsky

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