linux-kernel - [PATCH 0/2] speed up /proc/filesystems

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250329192821.822253-1-mjguzik@gmail.com>
Date: Sat, 29 Mar 2025 20:28:19 +0100
From: Mateusz Guzik <mjguzik@...il.com>
To: brauner@...nel.org
Cc: viro@...iv.linux.org.uk,
	jack@...e.cz,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Mateusz Guzik <mjguzik@...il.com>
Subject: [PATCH 0/2] speed up /proc/filesystems

I accidentally found out it is used a lot *and* is incredibly slow.

Part of it is procfs protecting the file from going away on each op,
other part is content generatin being dog slow.

Turns out procfs did not provide an interface to mark files as
permanent. I added easiest hack I could think of to remedy the problem,
I am not going to argue how to do it.

Mateusz Guzik (2):
  proc: add a helper for marking files as permanent by external
    consumers
  fs: cache the string generated by reading /proc/filesystems

 fs/filesystems.c        | 148 +++++++++++++++++++++++++++++++++++++---
 fs/proc/generic.c       |   6 ++
 include/linux/proc_fs.h |   1 +
 3 files changed, 147 insertions(+), 8 deletions(-)

-- 
2.43.0