From: Linus Torvalds <torvalds@linux-foundation.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: Jan Kara <jack@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>,
James Bottomley <James.Bottomley@hansenpartnership.com>,
Waiman Long <longman@redhat.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
Ingo Molnar <mingo@kernel.org>,
Miklos Szeredi <mszeredi@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Larry Woodman <lwoodman@redhat.com>,
"Wangkai (Kevin,C)" <wangkai86@huawei.com>,
linux-mm <linux-mm@kvack.org>, Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH v5 0/6] fs/dcache: Track & limit # of negative dentries
Date: Sat, 14 Jul 2018 11:00:32 -0700 [thread overview]
Message-ID: <CA+55aFw1vrsTjJyoq4Q3jBwv1nXaTkkmSbHO6vozWZuTc7_6Kg@mail.gmail.com> (raw)
In-Reply-To: <20180714173516.uumlhs4wgfgrlc32@devuan>
On Sat, Jul 14, 2018 at 10:35 AM Pavel Machek <pavel@ucw.cz> wrote:
>
> Could we allocate -ve entries from separate slab?
No, because negative dentrires don't stay negative.
Every single positive dentry starts out as a negative dentry that is
passed in to "lookup()" to maybe be made positive.
And most of the time they <i>do</i> turn positive, because most of the
time people actually open files that exist.
But then occasionally you don't, because you're just blindly opening a
filename whether it exists or not (to _check_ whether it's there).
Linus
next prev parent reply other threads:[~2018-07-14 18:00 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1530510723-24814-1-git-send-email-longman@redhat.com>
[not found] ` <CA+55aFyH6dHw-7R3364dn32J4p7kxT=TqmnuozCn9_Bz-MHhxQ@mail.gmail.com>
2018-07-02 21:18 ` Andrew Morton
2018-07-02 22:21 ` Matthew Wilcox
2018-07-02 22:31 ` Linus Torvalds
2018-07-02 22:34 ` James Bottomley
2018-07-02 22:54 ` Linus Torvalds
2018-07-02 23:03 ` Linus Torvalds
2018-07-02 23:19 ` Andrew Morton
2018-07-02 23:28 ` Linus Torvalds
2018-07-03 1:38 ` Waiman Long
2018-07-03 9:18 ` Jan Kara
2018-07-14 17:35 ` Pavel Machek
2018-07-14 18:00 ` Linus Torvalds [this message]
2018-07-14 18:34 ` Al Viro
2018-07-14 18:36 ` Al Viro
2018-07-14 18:43 ` Linus Torvalds
2018-07-18 16:01 ` Waiman Long
2018-07-03 1:11 ` Waiman Long
2018-07-03 13:48 ` Vlastimil Babka
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