linux-kernel - Re: [PATCH 02/10] staging: erofs: fix race when the managed cache is enabled

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Message-ID: <fa61d737-216e-c644-5d23-28d520182262@huawei.com>
Date:   Thu, 22 Nov 2018 20:41:15 +0800
From:   Gao Xiang <gaoxiang25@...wei.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     <devel@...verdev.osuosl.org>, <linux-erofs@...ts.ozlabs.org>,
        Chao Yu <yuchao0@...wei.com>,
        LKML <linux-kernel@...r.kernel.org>, <weidu.du@...wei.com>,
        Miao Xie <miaoxie@...wei.com>
Subject: Re: [PATCH 02/10] staging: erofs: fix race when the managed cache is
 enabled

Hi Greg,

On 2018/11/22 20:26, Greg Kroah-Hartman wrote:
> Ugh, every page?  Ok, nevermind, I take back my objections.  You all are
> crazy and need to do crazy things like this :)

...Do you have some idea about this? ... I think it is fairly normal... :(

We have a large number of managed workgroups, the current use case is the 4k compressed size,
each compressed page has a workgroup, but erofs also has reclaim paths to free them for low memory cases.

But since the structure (z_erofs_vle_workgroup, erofs_workgroup) is critical,
I need to make it as small as possible.

Thanks,
Gao Xiang