All of lore.kernel.org
 help / color / mirror / Atom feed
From: Peter Oskolkov <posk@posk.io>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel@vger.kernel.org, linux-api@vger.kernel.org
Cc: Paul Turner <pjt@google.com>, Ben Segall <bsegall@google.com>,
	Peter Oskolkov <posk@google.com>, Peter Oskolkov <posk@posk.io>,
	Andrei Vagin <avagin@google.com>, Jann Horn <jannh@google.com>,
	Thierry Delisle <tdelisle@uwaterloo.ca>
Subject: [PATCH 0/5 v0.6] sched/umcg: RFC UMCG patchset
Date: Fri, 17 Sep 2021 11:03:18 -0700	[thread overview]
Message-ID: <20210917180323.278250-1-posk@google.com> (raw)

Many thanks to Jann Horn for a detailed review of v0.5:
https://lore.kernel.org/lkml/20210908184905.163787-1-posk@google.com/

The main change in this patchet vs v0.5 is pinning of
pages containing struct umcg_task of RUNNING workers
and their servers. This allows uaccess operations from
sched_submit_work (preempt-disabled). The pages are
pinned only for RUNNING workers, i.e. at most NR_CPUS
pages are pinned by UMCG at any one time, across the
whole machine.

A smaller change is the move of worker wakeup processing
from sched_update_worker() to exit_to_user_mode_loop(),
to ensure that no kernel locks are held if the worker
is descheduled there.

Commit messages in patches 2 and 3 list more changes.

Peter Oskolkov (5):
  sched/umcg: add WF_CURRENT_CPU and externise ttwu
  sched/umcg: RFC: add userspace atomic helpers
  sched/umcg: RFC: implement UMCG syscalls
  sched/umcg: add Documentation/userspace-api/umcg.rst
  sched/umcg: add Documentation/userspace-api/umcg.txt

 Documentation/userspace-api/umcg.rst   | 550 ++++++++++++++++++
 Documentation/userspace-api/umcg.txt   | 537 ++++++++++++++++++
 arch/x86/entry/syscalls/syscall_64.tbl |   2 +
 fs/exec.c                              |   1 +
 include/linux/sched.h                  |  56 ++
 include/linux/syscalls.h               |   4 +
 include/uapi/asm-generic/unistd.h      |   8 +-
 include/uapi/linux/umcg.h              | 117 ++++
 init/Kconfig                           |  10 +
 kernel/entry/common.c                  |   1 +
 kernel/exit.c                          |   2 +
 kernel/sched/Makefile                  |   1 +
 kernel/sched/core.c                    |  18 +-
 kernel/sched/fair.c                    |   4 +
 kernel/sched/sched.h                   |  15 +-
 kernel/sched/umcg.c                    | 745 +++++++++++++++++++++++++
 kernel/sched/umcg_uaccess.h            | 344 ++++++++++++
 kernel/sys_ni.c                        |   4 +
 18 files changed, 2408 insertions(+), 11 deletions(-)
 create mode 100644 Documentation/userspace-api/umcg.rst
 create mode 100644 Documentation/userspace-api/umcg.txt
 create mode 100644 include/uapi/linux/umcg.h
 create mode 100644 kernel/sched/umcg.c
 create mode 100644 kernel/sched/umcg_uaccess.h

--
2.25.1


             reply	other threads:[~2021-09-17 18:03 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-17 18:03 Peter Oskolkov [this message]
2021-09-17 18:03 ` [PATCH 1/5 v0.6] sched/umcg: add WF_CURRENT_CPU and externise ttwu Peter Oskolkov
2021-09-17 18:03 ` [PATCH 2/5 v0.6] sched/umcg: RFC: add userspace atomic helpers Peter Oskolkov
2021-09-19 18:25   ` Tao Zhou
2021-09-28 21:58   ` Thomas Gleixner
2021-09-28 23:07     ` Peter Oskolkov
2021-09-17 18:03 ` [PATCH 3/5 v0.6] sched/umcg: RFC: implement UMCG syscalls Peter Oskolkov
2021-09-19 18:25   ` Tao Zhou
2021-09-19 23:24   ` kernel test robot
2021-09-20  5:18   ` kernel test robot
2021-09-28  9:21   ` Thomas Gleixner
2021-09-28 17:26     ` Peter Oskolkov
2021-09-28 20:00       ` Thomas Gleixner
2021-09-17 18:03 ` [PATCH 4/5 v0.6] sched/umcg: add Documentation/userspace-api/umcg.rst Peter Oskolkov
2021-09-17 18:03 ` [PATCH 5/5 v0.6] sched/umcg: add Documentation/userspace-api/umcg.txt Peter Oskolkov
2021-09-22 18:39   ` Thierry Delisle
2021-10-11 22:45     ` Peter Oskolkov
2021-10-12 16:25       ` Thierry Delisle
2021-10-12 16:58         ` Peter Oskolkov
2021-10-12 18:46           ` Thierry Delisle
2021-10-12 21:44             ` Peter Oskolkov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210917180323.278250-1-posk@google.com \
    --to=posk@posk.io \
    --cc=avagin@google.com \
    --cc=bsegall@google.com \
    --cc=jannh@google.com \
    --cc=linux-api@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@redhat.com \
    --cc=peterz@infradead.org \
    --cc=pjt@google.com \
    --cc=posk@google.com \
    --cc=tdelisle@uwaterloo.ca \
    --cc=tglx@linutronix.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.