Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1211273

[PATCH v2 0/8] Add rcu_sync infrastructure to avoid _expedited() in percpu-rwsem

Show all headers | View raw

Hello,

Now that sb->s_writers was changed to use percpu_rw_semaphore let me
send v2.

Changes:

	- whitespace fix in 1/8.

	- remove EXPORT_SYMBOL() in 3/8, currently rcu_sync has no
	  modular users.

	- 5/8 is new. This ugly hack pairs with another one:
	  "shift percpu_counter_destroy() into destroy_super_work()"
	  https://git.kernel.org/cgit/linux/kernel/git/viro/vfs.git/commit/?h=for-next&id=853b39a7c82826b8413048feec7bf08e98ce7a84
	  They both will be reverted later.

	  The problem is that we have 2 series routed via different
	  trees, RCU and VFS. We need this hack to ensure that this
	  series won't break alloc_super() which currently assumes that
	  destroy_super()->percpu_free_rwsem() is safe after kzalloc().
	  This way these 2 series do not depend on each other, we can
	  test/change/revert/etc them independently.

	  We will add rcu_sync_dtor() into deactivate_locked_super()
	  later and revert both hacks.
Oleg.

 include/linux/percpu-rwsem.h  |    3 +-
 include/linux/rcusync.h       |   56 +++++++++++++++
 kernel/locking/percpu-rwsem.c |   85 ++++++++---------------
 kernel/rcu/Makefile           |    2 +-
 kernel/rcu/sync.c             |  151 +++++++++++++++++++++++++++++++++++++++++
 5 files changed, 240 insertions(+), 57 deletions(-)

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH v2 0/8] Add rcu_sync infrastructure to avoid _expedited()  in percpu-rwsem Oleg Nesterov <oleg@redhat.com> - 2015-08-21 19:50 +0200
  [PATCH v2 3/8] rcusync: Add the CONFIG_PROVE_RCU checks Oleg Nesterov <oleg@redhat.com> - 2015-08-21 19:50 +0200
  [PATCH v2 6/8] percpu-rwsem: change it to rely on rss_sync  infrastructure Oleg Nesterov <oleg@redhat.com> - 2015-08-21 19:50 +0200
  [PATCH v2 5/8] percpu-rwsem: make percpu_free_rwsem() after  kzalloc() safe Oleg Nesterov <oleg@redhat.com> - 2015-08-21 19:50 +0200
  [PATCH v2 8/8] percpu-rwsem: cleanup the lockdep annotations in  percpu_down_read() Oleg Nesterov <oleg@redhat.com> - 2015-08-21 19:50 +0200
  [PATCH v2 4/8] rcusync: Introduce rcu_sync_dtor() Oleg Nesterov <oleg@redhat.com> - 2015-08-21 19:50 +0200
  [PATCH v2 7/8] percpu-rwsem: fix the comments outdated by rcu_sync Oleg Nesterov <oleg@redhat.com> - 2015-08-21 19:50 +0200
  [PATCH v2 2/8] rcusync: Introduce struct rcu_sync_ops Oleg Nesterov <oleg@redhat.com> - 2015-08-21 19:50 +0200
  [PATCH v2 1/8] rcu: Create rcu_sync infrastructure Oleg Nesterov <oleg@redhat.com> - 2015-08-21 19:50 +0200
  Re: [PATCH v2 0/8] Add rcu_sync infrastructure to avoid _expedited()  in percpu-rwsem "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-08-22 18:40 +0200
    Re: [PATCH v2 0/8] Add rcu_sync infrastructure to avoid  _expedited() in percpu-rwsem Oleg Nesterov <oleg@redhat.com> - 2015-08-24 17:40 +0200
      parse_args() is too unforgivable? Oleg Nesterov <oleg@redhat.com> - 2015-08-24 20:40 +0200
        Re: parse_args() is too unforgivable? Rusty Russell <rusty@rustcorp.com.au> - 2015-08-25 03:40 +0200
          [PATCH 0/1] params: don't ignore the rest of cmdline if  parse_one() fails Oleg Nesterov <oleg@redhat.com> - 2015-08-25 17:30 +0200
            [PATCH 1/1] params: don't ignore the rest of cmdline if  parse_one() fails Oleg Nesterov <oleg@redhat.com> - 2015-08-25 17:30 +0200
              Re: [PATCH 1/1] params: don't ignore the rest of cmdline if parse_one() fails Rusty Russell <rusty@rustcorp.com.au> - 2015-08-26 03:20 +0200
      Re: [PATCH v2 0/8] Add rcu_sync infrastructure to avoid  _expedited() in percpu-rwsem "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-08-26 02:30 +0200
        Re: [PATCH v2 0/8] Add rcu_sync infrastructure to avoid  _expedited() in percpu-rwsem Oleg Nesterov <oleg@redhat.com> - 2015-08-26 14:20 +0200
          Re: [PATCH v2 0/8] Add rcu_sync infrastructure to avoid  _expedited() in percpu-rwsem Oleg Nesterov <oleg@redhat.com> - 2015-08-26 15:00 +0200
            Re: [PATCH v2 0/8] Add rcu_sync infrastructure to avoid  _expedited() in percpu-rwsem "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-08-26 16:40 +0200

csiph-web