From: ebiederm@xmission.com (Eric W. Biederman)
To: Oleg Nesterov <oleg@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Deepa Dinamani <deepa.kernel@gmail.com>,
linux-kernel@vger.kernel.org, arnd@arndb.de, dbueso@suse.de,
axboe@kernel.dk, dave@stgolabs.net, e@80x24.org,
jbaron@akamai.com, linux-fsdevel@vger.kernel.org,
linux-aio@kvack.org, omar.kilani@gmail.com, tglx@linutronix.de,
stable@vger.kernel.org, Al Viro <viro@ZenIV.linux.org.uk>,
Linus Torvalds <torvalds@linux-foundation.org>,
David Laight <David.Laight@ACULAB.COM>,
linux-arch@vger.kernel.org
Subject: [RFC PATCH 0/5]: Removing saved_sigmask
Date: Fri, 07 Jun 2019 16:39:54 -0500 [thread overview]
Message-ID: <87k1dxaxcl.fsf_-_@xmission.com> (raw)
In-Reply-To: <20190606140814.GA13440@redhat.com> (Oleg Nesterov's message of "Thu, 6 Jun 2019 16:08:14 +0200")
While reviewing Oleg's patches I realized a bunch of the logic around
saved_sigmask was redundant. So I dug just to see what I could see.
I turns out that real_blocked and saved_sigmask were different
implementations of the same idea for slightly different purposes.
Which means we only need either real_blocked or saved_sigmask.
I chose real_blocked as it has just a little bit of code associated
with it to disable optimizations on the signal sending path that do
not apply to blocked signals.
I did a little bit of cleanup of the users. Modified the core to keep
real_blocked in sync with blocked except while a clever system call that
like pselect or sigtimedwait is running.
After the dust cleared this allowed restore_sigmask and all of the logic
to keep it valid to be removed entirely.
I have only done the most cursory of testing at this point. Does anyone
have any thoughts in cleaning up the code in this direction?
Eric W. Biederman (5):
signal: Teach sigsuspend to use set_user_sigmask
signal/kvm: Stop using sigprocmask in kvm_sigset_(activate|deactivate)
signal: Always keep real_blocked in sync with blocked
signal: Remove saved_sigmask
signal: Remove the unnecessary restore_sigmask flag
arch/arc/include/asm/thread_info.h | 1 -
arch/arm/include/asm/thread_info.h | 1 -
arch/arm64/include/asm/thread_info.h | 1 -
arch/c6x/include/asm/thread_info.h | 1 -
arch/csky/include/asm/thread_info.h | 2 -
arch/h8300/include/asm/thread_info.h | 1 -
arch/hexagon/include/asm/thread_info.h | 1 -
arch/m68k/include/asm/thread_info.h | 1 -
arch/mips/include/asm/thread_info.h | 1 -
arch/nds32/include/asm/thread_info.h | 2 -
arch/nios2/include/asm/thread_info.h | 2 -
arch/riscv/include/asm/thread_info.h | 1 -
arch/s390/include/asm/thread_info.h | 1 -
arch/sparc/include/asm/thread_info_32.h | 1 -
arch/um/include/asm/thread_info.h | 1 -
arch/unicore32/include/asm/thread_info.h | 1 -
arch/xtensa/include/asm/thread_info.h | 1 -
include/linux/sched.h | 5 --
include/linux/sched/signal.h | 84 +-------------------------------
kernel/ptrace.c | 15 ++----
kernel/signal.c | 56 +++++++++------------
virt/kvm/kvm_main.c | 11 +----
22 files changed, 31 insertions(+), 160 deletions(-)
Eric
WARNING: multiple messages have this Message-ID (diff)
From: ebiederm@xmission.com (Eric W. Biederman)
To: Oleg Nesterov <oleg@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Deepa Dinamani <deepa.kernel@gmail.com>,
linux-kernel@vger.kernel.org, arnd@arndb.de, dbueso@suse.de,
axboe@kernel.dk, dave@stgolabs.net, e@80x24.org,
jbaron@akamai.com, linux-fsdevel@vger.kernel.org,
linux-aio@kvack.org, omar.kilani@gmail.com, tglx@linutronix.de,
stable@vger.kernel.org, Al Viro <viro@ZenIV.linux.org.uk>,
Linus Torvalds <torvalds@linux-foundation.org>,
David Laight <David.Laight@ACULAB.COM>,
<linux-arch@vger.kernel.org>
Subject: [RFC PATCH 0/5]: Removing saved_sigmask
Date: Fri, 07 Jun 2019 16:39:54 -0500 [thread overview]
Message-ID: <87k1dxaxcl.fsf_-_@xmission.com> (raw)
In-Reply-To: <20190606140814.GA13440@redhat.com> (Oleg Nesterov's message of "Thu, 6 Jun 2019 16:08:14 +0200")
While reviewing Oleg's patches I realized a bunch of the logic around
saved_sigmask was redundant. So I dug just to see what I could see.
I turns out that real_blocked and saved_sigmask were different
implementations of the same idea for slightly different purposes.
Which means we only need either real_blocked or saved_sigmask.
I chose real_blocked as it has just a little bit of code associated
with it to disable optimizations on the signal sending path that do
not apply to blocked signals.
I did a little bit of cleanup of the users. Modified the core to keep
real_blocked in sync with blocked except while a clever system call that
like pselect or sigtimedwait is running.
After the dust cleared this allowed restore_sigmask and all of the logic
to keep it valid to be removed entirely.
I have only done the most cursory of testing at this point. Does anyone
have any thoughts in cleaning up the code in this direction?
Eric W. Biederman (5):
signal: Teach sigsuspend to use set_user_sigmask
signal/kvm: Stop using sigprocmask in kvm_sigset_(activate|deactivate)
signal: Always keep real_blocked in sync with blocked
signal: Remove saved_sigmask
signal: Remove the unnecessary restore_sigmask flag
arch/arc/include/asm/thread_info.h | 1 -
arch/arm/include/asm/thread_info.h | 1 -
arch/arm64/include/asm/thread_info.h | 1 -
arch/c6x/include/asm/thread_info.h | 1 -
arch/csky/include/asm/thread_info.h | 2 -
arch/h8300/include/asm/thread_info.h | 1 -
arch/hexagon/include/asm/thread_info.h | 1 -
arch/m68k/include/asm/thread_info.h | 1 -
arch/mips/include/asm/thread_info.h | 1 -
arch/nds32/include/asm/thread_info.h | 2 -
arch/nios2/include/asm/thread_info.h | 2 -
arch/riscv/include/asm/thread_info.h | 1 -
arch/s390/include/asm/thread_info.h | 1 -
arch/sparc/include/asm/thread_info_32.h | 1 -
arch/um/include/asm/thread_info.h | 1 -
arch/unicore32/include/asm/thread_info.h | 1 -
arch/xtensa/include/asm/thread_info.h | 1 -
include/linux/sched.h | 5 --
include/linux/sched/signal.h | 84 +-------------------------------
kernel/ptrace.c | 15 ++----
kernel/signal.c | 56 +++++++++------------
virt/kvm/kvm_main.c | 11 +----
22 files changed, 31 insertions(+), 160 deletions(-)
Eric
next prev parent reply other threads:[~2019-06-07 21:39 UTC|newest]
Thread overview: 154+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-22 3:21 [PATCH v2] signal: Adjust error codes according to restore_user_sigmask() Deepa Dinamani
2019-05-22 15:05 ` Oleg Nesterov
2019-05-22 15:55 ` Deepa Dinamani
2019-05-22 16:14 ` Oleg Nesterov
2019-05-22 16:33 ` Deepa Dinamani
2019-05-23 9:03 ` David Laight
2019-05-23 14:59 ` Oleg Nesterov
2019-05-23 16:18 ` David Laight
2019-05-23 16:36 ` Oleg Nesterov
2019-05-23 16:56 ` David Laight
2019-05-23 18:06 ` Deepa Dinamani
2019-05-23 20:41 ` Deepa Dinamani
2019-05-23 21:06 ` Deepa Dinamani
2019-05-24 9:58 ` David Laight
2019-05-24 14:10 ` Oleg Nesterov
2019-05-24 15:16 ` Deepa Dinamani
2019-05-24 16:33 ` Oleg Nesterov
2019-05-24 17:01 ` Deepa Dinamani
2019-05-27 15:04 ` Oleg Nesterov
2019-05-28 20:47 ` Deepa Dinamani
2019-05-29 16:57 ` Oleg Nesterov
2019-05-29 18:42 ` Deepa Dinamani
2019-05-28 9:02 ` David Laight
2019-05-28 9:12 ` David Laight
2019-05-28 11:37 ` Deepa Dinamani
2019-05-28 12:04 ` David Laight
2019-05-24 14:19 ` Oleg Nesterov
2019-05-24 14:29 ` Deepa Dinamani
2019-05-24 14:51 ` Oleg Nesterov
2019-05-24 13:29 ` Oleg Nesterov
2019-05-24 14:59 ` David Laight
2019-05-24 15:09 ` David Laight
2019-05-24 15:46 ` Oleg Nesterov
2019-05-24 15:44 ` Oleg Nesterov
2019-05-24 16:40 ` David Laight
2019-05-23 14:33 ` Oleg Nesterov
2019-05-22 22:18 ` Chris Down
2019-05-22 22:52 ` Deepa Dinamani
2019-05-29 16:11 ` pselect/etc semantics (Was: [PATCH v2] signal: Adjust error codes according to restore_user_sigmask()) Oleg Nesterov
2019-05-29 16:54 ` David Laight
2019-05-29 18:50 ` Eric Wong
2019-05-30 9:34 ` David Laight
2019-05-30 13:04 ` pselect/etc semantics Eric W. Biederman
2019-05-29 16:56 ` pselect/etc semantics (Was: [PATCH v2] signal: Adjust error codes according to restore_user_sigmask()) Deepa Dinamani
2019-05-29 18:26 ` Deepa Dinamani
2019-05-29 22:32 ` Arnd Bergmann
2019-05-30 1:54 ` pselect/etc semantics Eric W. Biederman
2019-05-30 18:28 ` Arnd Bergmann
2019-05-30 14:40 ` pselect/etc semantics (Was: [PATCH v2] signal: Adjust error codes according to restore_user_sigmask()) Oleg Nesterov
2019-05-30 18:37 ` Arnd Bergmann
2019-05-30 13:01 ` pselect/etc semantics Eric W. Biederman
2019-05-30 15:18 ` David Laight
2019-05-30 16:13 ` Oleg Nesterov
2019-05-30 15:38 ` Eric W. Biederman
2019-05-30 15:48 ` Deepa Dinamani
2019-05-30 16:59 ` Deepa Dinamani
2019-05-30 16:08 ` Oleg Nesterov
2019-05-30 17:20 ` Eric W. Biederman
2019-05-30 16:22 ` David Laight
2019-05-30 15:57 ` Oleg Nesterov
2019-05-30 21:03 ` Eric Wong
2019-06-04 13:41 ` [PATCH] signal: remove the wrong signal_pending() check in restore_user_sigmask() Oleg Nesterov
2019-06-04 15:31 ` Eric W. Biederman
2019-06-04 15:31 ` Eric W. Biederman
2019-06-04 15:57 ` David Laight
2019-06-04 15:57 ` David Laight
2019-06-04 16:37 ` Arnd Bergmann
2019-06-04 18:14 ` Deepa Dinamani
2019-06-04 18:35 ` Eric Wong
2019-06-04 21:26 ` Linus Torvalds
2019-06-04 22:24 ` Eric Wong
2019-06-04 23:51 ` Eric W. Biederman
2019-06-05 9:04 ` Oleg Nesterov
2019-06-05 8:56 ` Oleg Nesterov
2019-06-05 9:02 ` David Laight
2019-06-05 9:25 ` Oleg Nesterov
2019-06-05 9:58 ` David Laight
2019-06-05 15:58 ` [PATCH -mm 0/1] signal: simplify set_user_sigmask/restore_user_sigmask Oleg Nesterov
2019-06-05 15:58 ` [PATCH -mm 1/1] " Oleg Nesterov
2019-06-06 0:14 ` kbuild test robot
2019-06-06 1:06 ` kbuild test robot
2019-06-06 7:25 ` Oleg Nesterov
2019-06-06 7:30 ` Sedat Dilek
2019-06-05 17:24 ` [PATCH -mm 0/1] " Linus Torvalds
2019-06-06 9:05 ` David Laight
2019-06-06 11:05 ` Oleg Nesterov
2019-06-06 11:29 ` David Laight
2019-06-06 12:41 ` Oleg Nesterov
2019-06-06 13:23 ` David Laight
2019-06-06 10:22 ` Oleg Nesterov
2019-06-06 11:32 ` [PATCH -mm V2 1/1] " Oleg Nesterov
2019-06-06 14:08 ` [PATCH 0/2] select: simplify the usage of restore_saved_sigmask_unless() Oleg Nesterov
2019-06-06 14:08 ` [PATCH 1/2] select: change do_poll() to return -ERESTARTNOHAND rather than -EINTR Oleg Nesterov
2019-06-07 18:05 ` Linus Torvalds
2019-06-06 14:09 ` [PATCH 2/2] select: shift restore_saved_sigmask_unless() into poll_select_copy_remaining() Oleg Nesterov
2019-06-07 21:39 ` Eric W. Biederman [this message]
2019-06-07 21:39 ` [RFC PATCH 0/5]: Removing saved_sigmask Eric W. Biederman
2019-06-07 21:41 ` [RFC PATCH 1/5] signal: Teach sigsuspend to use set_user_sigmask Eric W. Biederman
2019-06-07 21:41 ` Eric W. Biederman
2019-06-07 21:41 ` Eric W. Biederman
2019-06-07 22:07 ` Linus Torvalds
2019-06-07 22:07 ` Linus Torvalds
2019-06-10 16:22 ` Oleg Nesterov
2019-06-10 21:20 ` Eric W. Biederman
2019-06-11 9:52 ` David Laight
2019-06-11 11:14 ` David Laight
2019-06-12 12:55 ` Eric W. Biederman
2019-06-12 12:55 ` Eric W. Biederman
2019-06-12 12:55 ` Eric W. Biederman
2019-06-12 13:24 ` David Laight
2019-06-12 13:24 ` David Laight
2019-06-12 13:35 ` Oleg Nesterov
2019-06-12 13:35 ` Oleg Nesterov
2019-06-12 13:39 ` David Laight
2019-06-12 13:39 ` David Laight
2019-06-11 15:46 ` David Laight
2019-06-11 15:46 ` David Laight
2019-06-12 12:40 ` Eric W. Biederman
2019-06-12 12:40 ` Eric W. Biederman
2019-06-12 12:40 ` Eric W. Biederman
2019-06-12 13:45 ` Oleg Nesterov
2019-06-12 14:18 ` David Laight
2019-06-12 15:11 ` Eric W. Biederman
2019-06-12 15:11 ` Eric W. Biederman
2019-06-12 15:37 ` Oleg Nesterov
2019-06-12 15:37 ` Oleg Nesterov
2019-06-13 8:48 ` David Laight
2019-06-13 8:48 ` David Laight
2019-06-13 9:43 ` Oleg Nesterov
2019-06-13 9:43 ` Oleg Nesterov
2019-06-13 10:56 ` David Laight
2019-06-13 10:56 ` David Laight
2019-06-13 12:43 ` Oleg Nesterov
2019-06-13 12:43 ` Oleg Nesterov
2019-06-11 18:55 ` Oleg Nesterov
2019-06-11 19:02 ` Eric W. Biederman
2019-06-11 19:02 ` Eric W. Biederman
2019-06-12 8:39 ` David Laight
2019-06-12 13:09 ` Eric W. Biederman
2019-06-12 13:09 ` Eric W. Biederman
2019-06-12 13:09 ` Eric W. Biederman
2019-06-07 21:41 ` [RFC PATCH 2/5] signal/kvm: Stop using sigprocmask in kvm_sigset_(activate|deactivate) Eric W. Biederman
2019-06-07 21:41 ` Eric W. Biederman
2019-06-07 21:41 ` Eric W. Biederman
2019-06-07 21:42 ` [RFC PATCH 3/5] signal: Always keep real_blocked in sync with blocked Eric W. Biederman
2019-06-07 21:42 ` Eric W. Biederman
2019-06-07 21:42 ` Eric W. Biederman
2019-06-07 21:43 ` [RFC PATCH 4/5] signal: Remove saved_sigmask Eric W. Biederman
2019-06-07 21:43 ` Eric W. Biederman
2019-06-07 21:43 ` Eric W. Biederman
2019-06-07 21:44 ` [RFC PATCH 5/5] signal: Remove the unnecessary restore_sigmask flag Eric W. Biederman
2019-06-07 21:44 ` Eric W. Biederman
2019-06-07 21:44 ` Eric W. Biederman
2019-06-11 18:58 ` [RFC PATCH 0/5]: Removing saved_sigmask Oleg Nesterov
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