From: Andrei Vagin <avagin@google.com>
To: Kees Cook <keescook@chromium.org>,
Peter Zijlstra <peterz@infradead.org>,
Christian Brauner <brauner@kernel.org>
Cc: linux-kernel@vger.kernel.org, Andrei Vagin <avagin@gmail.com>,
Andy Lutomirski <luto@amacapital.net>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Ingo Molnar <mingo@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
Peter Oskolkov <posk@google.com>,
Tycho Andersen <tycho@tycho.pizza>,
Will Drewry <wad@chromium.org>,
Vincent Guittot <vincent.guittot@linaro.org>
Subject: [PATCH 0/5 v3] seccomp: add the synchronous mode for seccomp_unotify
Date: Thu, 10 Nov 2022 23:31:49 -0800 [thread overview]
Message-ID: <20221111073154.784261-1-avagin@google.com> (raw)
From: Andrei Vagin <avagin@gmail.com>
seccomp_unotify allows more privileged processes do actions on behalf
of less privileged processes.
In many cases, the workflow is fully synchronous. It means a target
process triggers a system call and passes controls to a supervisor
process that handles the system call and returns controls back to the
target process. In this context, "synchronous" means that only one
process is running and another one is waiting.
The new WF_CURRENT_CPU flag advises the scheduler to move the wakee to
the current CPU. For such synchronous workflows, it makes context
switches a few times faster.
Right now, each interaction takes 12µs. With this patch, it takes about
3µs.
v2: clean up the first patch and add the test.
v3: update commit messages and a few fixes suggested by Kees Cook.
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Peter Oskolkov <posk@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tycho Andersen <tycho@tycho.pizza>
Cc: Will Drewry <wad@chromium.org>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Andrei Vagin (4):
seccomp: don't use semaphore and wait_queue together
sched: add a few helpers to wake up tasks on the current cpu
seccomp: add the synchronous mode for seccomp_unotify
selftest/seccomp: add a new test for the sync mode of
seccomp_user_notify
Peter Oskolkov (1):
sched: add WF_CURRENT_CPU and externise ttwu
include/linux/completion.h | 1 +
include/linux/swait.h | 1 +
include/linux/wait.h | 3 +
include/uapi/linux/seccomp.h | 4 +
kernel/sched/completion.c | 12 +++
kernel/sched/core.c | 5 +-
kernel/sched/fair.c | 4 +
kernel/sched/sched.h | 13 +--
kernel/sched/swait.c | 11 +++
kernel/sched/wait.c | 5 ++
kernel/seccomp.c | 72 +++++++++++++--
tools/testing/selftests/seccomp/seccomp_bpf.c | 88 +++++++++++++++++++
12 files changed, 204 insertions(+), 15 deletions(-)
--
2.37.2
next reply other threads:[~2022-11-11 7:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-11 7:31 Andrei Vagin [this message]
2022-11-11 7:31 ` [PATCH 1/5] seccomp: don't use semaphore and wait_queue together Andrei Vagin
2022-11-11 7:31 ` [PATCH 2/5] sched: add WF_CURRENT_CPU and externise ttwu Andrei Vagin
2022-11-11 7:31 ` [PATCH 3/5] sched: add a few helpers to wake up tasks on the current cpu Andrei Vagin
2022-11-11 7:31 ` [PATCH 4/5] seccomp: add the synchronous mode for seccomp_unotify Andrei Vagin
2022-11-11 7:31 ` [PATCH 5/5] selftest/seccomp: add a new test for the sync mode of seccomp_user_notify Andrei Vagin
2022-11-18 22:38 ` [PATCH 0/5 v3] seccomp: add the synchronous mode for seccomp_unotify Kees Cook
2022-11-22 7:52 ` Andrei Vagin
2022-12-06 6:52 ` Andrei Vagin
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