linux-kernel - Re: [PATCH 00/11] md: avoid counter operation conflicts

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Message-ID: <140c7f16-4c2a-390a-7021-53d3723626ec@huaweicloud.com>
Date: Tue, 26 Mar 2024 22:01:45 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: tada keisuke <keisuke1.tada@...xia.com>, "song@...nel.org"
 <song@...nel.org>
Cc: "linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH 00/11] md: avoid counter operation conflicts

Hi,

在 2024/03/26 18:29, tada keisuke 写道:
> Currently, active_aligned_reads and nr_pending used as counters are atomic types.
> Therefore, when inc/dec in a multi-core results in conflicts.

I don't uderstand what's the problem here, what's wrong with atomic
types in a multi-core system?

Thanks,
Kuai