linux-kernel - [PATCHSET v6 0/4] Split iowait into two states

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: <20240819154259.215504-1-axboe@kernel.dk>
Date: Mon, 19 Aug 2024 09:39:45 -0600
From: Jens Axboe <axboe@...nel.dk>
To: linux-kernel@...r.kernel.org
Cc: peterz@...radead.org,
	tglx@...utronix.de
Subject: [PATCHSET v6 0/4] Split iowait into two states

Hi,

This is v6 of the patchset where the current in_iowait state is split
into two parts:

1) The "task is sleeping waiting on IO", and would like cpufreq goodness
   in terms of sleep and wakeup latencies.
2) The above, and also accounted as such in the iowait stats.

The current ->in_iowait covers both, this series splits it into two types
of state so that each can be controlled seperately.

Patches 1..3 are prep patches, changing the type of
task_struct->nr_iowait and adding helpers to manipulate the iowait counts.

Patch 4 does the actual splitting.

This has been sitting for a while, would be nice to get this queued up
for 6.12. Comments welcome!

 arch/s390/appldata/appldata_base.c |  2 +-
 arch/s390/appldata/appldata_os.c   |  2 +-
 block/blk-cgroup.c                 |  2 +-
 fs/proc/stat.c                     |  2 +-
 include/linux/sched.h              | 10 ++++-
 include/linux/sched/stat.h         |  5 ++-
 kernel/locking/mutex.c             |  4 +-
 kernel/locking/rtmutex_api.c       |  4 +-
 kernel/sched/core.c                | 68 ++++++++++++++++++++++++------
 kernel/sched/cputime.c             |  3 +-
 kernel/sched/sched.h               |  5 ++-
 kernel/time/tick-sched.c           |  6 +--
 12 files changed, 81 insertions(+), 32 deletions(-)

Since v5:
- Make nr_iowait atomic_long_t unconditionally, as 32-bit archs have
  it as a 32-bit type. This avoids the ifdef stuff in sched/core.c.
  Thanks to Zhang Qiao for that suggestion.

-- 
Jens Axboe