From: Probir Roy <proy.cse@gmail.com>
To: kernelnewbies@kernelnewbies.org
Subject: locality of extent status tree traversal
Date: Mon, 6 May 2019 12:51:21 -0500 [thread overview]
Message-ID: <CALe4XzbXEB4xf0DtzvK0+wTHVF6DjenUU8EycR=HbRZfpLUjLw@mail.gmail.com> (raw)
Hi,
I am running Phoronix-fio benchmark on Linux kernel 4.18.0-rc5. I
observe the same nodes have been traversed on the extent status tree
in "ext4_es_lookup_extent" function when ext4 write begins. What's the
locality signature of ext4_es_lookup_extent? Is it possible that same
logical block being looked up repeatedly (Temporal)? Is it possible
that co-located logical blocks are searched by ext4_es_lookup_extent
(spatial)?
--
Probir Roy
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