linux-kernel - [RFC][PATCH 0/2] mm: tweak page cache migration

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Message-Id: <20200501210516.DFAFF456@viggo.jf.intel.com>
Date:   Fri, 01 May 2020 14:05:16 -0700
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     linux-kernel@...r.kernel.org
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>, npiggin@...il.com,
        akpm@...ux-foundation.org, willy@...radead.org,
        yang.shi@...ux.alibaba.com, linux-mm@...ck.org
Subject: [RFC][PATCH 0/2] mm: tweak page cache migration

First of all, I think this little slice of code is a bit
under-documented.  Perhaps this will help clarify things.

I'm pretty confident the page_count() check in the first
patch is right, which is why I removed it outright.  The
xas_load() check is a bit murkier, so I just left a
warning in for it.

Cc: Nicholas Piggin <npiggin@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Matthew Wilcox (Oracle) <willy@...radead.org>
Cc: Yang Shi <yang.shi@...ux.alibaba.com>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org