linux-kernel - Re: [PATCH v3 5/6] erofs: use struct lockref to replace handcrafted approach

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Message-ID: <20230530115912.0000195a.zbestahu@gmail.com>
Date:   Tue, 30 May 2023 11:59:12 +0800
From:   Yue Hu <zbestahu@...il.com>
To:     Gao Xiang <hsiangkao@...ux.alibaba.com>
Cc:     linux-erofs@...ts.ozlabs.org, LKML <linux-kernel@...r.kernel.org>,
        huyue2@...lpad.com
Subject: Re: [PATCH v3 5/6] erofs: use struct lockref to replace handcrafted
 approach

On Mon, 29 May 2023 20:37:27 +0800
Gao Xiang <hsiangkao@...ux.alibaba.com> wrote:

> Let's avoid the current handcrafted lockref although `struct lockref`
> inclusion usually increases extra 4 bytes with an explicit spinlock if
> CONFIG_DEBUG_SPINLOCK is off.
> 
> Apart from the size difference, note that the meaning of refcount is
> also changed to active users. IOWs, it doesn't take an extra refcount
> for XArray tree insertion.
> 
> I don't observe any significant performance difference at least on
> our cloud compute server but the new one indeed simplifies the
> overall codebase a bit.
> 
> Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>

Reviewed-by: Yue Hu <huyue2@...lpad.com>