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[172.10.233.147]) by smtp.gmail.com with ESMTPSA id l7sm522243oth.73.2020.11.24.18.50.45 (version=TLS1 cipher=ECDHE-ECDSA-AES128-SHA bits=128/128); Tue, 24 Nov 2020 18:50:46 -0800 (PST) Date: Tue, 24 Nov 2020 18:50:32 -0800 (PST) From: Hugh Dickins X-X-Sender: hugh@eggly.anvils To: Matthew Wilcox cc: Hugh Dickins , Andrew Morton , Jan Kara , William Kucharski , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, hch@lst.de, hannes@cmpxchg.org, yang.shi@linux.alibaba.com, dchinner@redhat.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v4 00/16] Overhaul multi-page lookups for THP In-Reply-To: <20201125023234.GH4327@casper.infradead.org> Message-ID: References: <20201112212641.27837-1-willy@infradead.org> <20201117153947.GL29991@casper.infradead.org> <20201117191513.GV29991@casper.infradead.org> <20201117234302.GC29991@casper.infradead.org> <20201125023234.GH4327@casper.infradead.org> User-Agent: Alpine 2.11 (LSU 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Wed, 25 Nov 2020, Matthew Wilcox wrote: > On Tue, Nov 17, 2020 at 11:43:02PM +0000, Matthew Wilcox wrote: > > On Tue, Nov 17, 2020 at 07:15:13PM +0000, Matthew Wilcox wrote: > > > I find both of these functions exceptionally confusing. Does this > > > make it easier to understand? > > > > Never mind, this is buggy. I'll send something better tomorrow. > > That took a week, not a day. *sigh*. At least this is shorter. Thanks, I'll give it a try (along with the other 4, on top of the 12: maybe on -rc5, maybe on today's mmotm, I'll decide that later). Shorter you say, that's good: I was disheartened by the way it got more complicated, after your initial truncate_inode_partial_page() neatness. Any hints on what was wrong with my simple fixup to that? (But I didn't spend any more time trying to prove or disprove it.) Hugh