linux-kernel - RFC: [PATCH 0/6] lustre: Improve locking in lu

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Date:   Fri, 11 May 2018 10:37:14 +1000
From:   NeilBrown <neilb@...e.com>
To:     Oleg Drokin <oleg.drokin@...el.com>,
        Andreas Dilger <andreas.dilger@...el.com>,
        James Simmons <jsimmons@...radead.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: RFC: [PATCH 0/6] lustre: Improve locking in lu_object.s

This is a followup to the patches that James recently posted
which addressed some locking issues in lu_object.c.
I said at the time that I thought the locking could be
improved further.  Here is the result of that thought.

The lu_keys_guard lock is now gone, replaced by a spin lock, an rwsem,
and some lockless code.
The lu_context_exit() function, which appears to have been a
performance problem at one point, is now completely lockless.

This is an RFC at this stage: I haven't included Greg on the email and
don't expect this to go upstream without some review - and maybe even
some testing.

Thanks,
NeilBrown

---

NeilBrown (6):
      staging: lustre: make key_set_version an atomic_t
      staging: lustre: use an rwsem instead of lu_key_initing_cnt.
      staging: lustre: remove locking from lu_context_exit()
      staging: lustre: use wait_event_var() in lu_context_key_degister()
      staging: lustre: remove lock from key register/degister
      staging: lustre: rename lu_keys_guard to lu_context_remembered_guard

 drivers/staging/lustre/lustre/include/lu_object.h  |    1 
 drivers/staging/lustre/lustre/obdclass/lu_object.c |  187 ++++++++------------
 2 files changed, 78 insertions(+), 110 deletions(-)

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