linux-kernel - [PATCH -next v2 0/2] kernel/sys: reduce tasklist

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Date:   Mon, 11 May 2020 17:03:51 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     akpm@...ux-foundation.org
Cc:     peterz@...radead.org, oleg@...hat.com, paulmck@...nel.org,
        tglx@...utronix.de, linux-kernel@...r.kernel.org, dave@...olabs.net
Subject: [PATCH -next v2 0/2] kernel/sys: reduce tasklist_lock usage get/set priorities

Hi,

The following are two patches that deal with removing the tasklist_lock entirely in
getpriority(2), and reducing the scope of it in setpriority(2). This also aligns
somewhat to what we already do with io priorities - although there both set and get
rely entirely on rcu.

Details in the changelog but this passes ltp tests. Please consider for v5.8.

Changes from v1:
 - split get and set into two patches.
 - improved changelog.

Thanks!

Davidlohr Bueso (2):
  kernel/sys: only rely on rcu for getpriority(2)
  kernel/sys: do not grab tasklist_lock for sys_setpriority(PRIO_PROCESS)

 kernel/sys.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

-- 
2.26.1