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From:   Jens Axboe <axboe@kernel.dk>
To:     linux-kernel@vger.kernel.org, io-uring@vger.kernel.org
Cc:     peterz@infradead.org, oleg@redhat.com, tglx@linutronix.de
Subject: [PATCHSET v5] Add support for TIF_NOTIFY_SIGNAL
Date:   Thu, 15 Oct 2020 07:16:56 -0600
Message-Id: <20201015131701.511523-1-axboe@kernel.dk>
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Hi,

The goal is this patch series is to decouple TWA_SIGNAL based task_work
from real signals and signal delivery. The motivation is speeding up
TWA_SIGNAL based task_work, particularly for threaded setups where
->sighand is shared across threads. See the last patch for numbers.


 arch/alpha/kernel/signal.c         |  1 -
 arch/arc/kernel/signal.c           |  2 +-
 arch/arm/kernel/signal.c           |  1 -
 arch/arm64/kernel/signal.c         |  1 -
 arch/c6x/kernel/signal.c           |  4 +--
 arch/csky/kernel/signal.c          |  1 -
 arch/h8300/kernel/signal.c         |  4 +--
 arch/hexagon/kernel/process.c      |  1 -
 arch/ia64/kernel/process.c         |  2 +-
 arch/m68k/kernel/signal.c          |  2 +-
 arch/microblaze/kernel/signal.c    |  2 +-
 arch/mips/kernel/signal.c          |  1 -
 arch/nds32/kernel/signal.c         |  4 +--
 arch/nios2/kernel/signal.c         |  2 +-
 arch/openrisc/kernel/signal.c      |  1 -
 arch/parisc/kernel/signal.c        |  4 +--
 arch/powerpc/kernel/signal.c       |  1 -
 arch/riscv/kernel/signal.c         |  4 +--
 arch/s390/kernel/signal.c          |  1 -
 arch/sh/kernel/signal_32.c         |  4 +--
 arch/sparc/kernel/signal_32.c      |  4 +--
 arch/sparc/kernel/signal_64.c      |  4 +--
 arch/um/kernel/process.c           |  2 +-
 arch/x86/include/asm/thread_info.h |  2 ++
 arch/x86/kernel/signal.c           |  7 +++--
 arch/xtensa/kernel/signal.c        |  2 +-
 include/linux/entry-common.h       |  9 +++++--
 include/linux/entry-kvm.h          |  4 +--
 include/linux/sched/signal.h       | 20 ++++++++++++---
 include/linux/tracehook.h          | 31 ++++++++++++++++++++--
 kernel/entry/common.c              |  7 +++--
 kernel/entry/kvm.c                 |  7 ++---
 kernel/events/uprobes.c            |  2 +-
 kernel/signal.c                    |  8 +++---
 kernel/task_work.c                 | 41 +++++++++++++++++++++---------
 35 files changed, 118 insertions(+), 75 deletions(-)


Changes since v4:
- Change ifdef as per Thomas
- Split x86 change from generic entry code
- Pass in TIF flags for arch_do_signal() to avoid doing multiple bit
  tests

-- 
Jens Axboe