Oleg Nesterov 8129ed2964
change sb_writers to use percpu_rw_semaphore ...
We can remove everything from struct sb_writers except frozen
and add the array of percpu_rw_semaphore's instead.
This patch doesn't remove sb_writers->wait_unfrozen yet, we keep
it for get_super_thawed(). We will probably remove it later.
This change tries to address the following problems:
- Firstly, __sb_start_write() looks simply buggy. It does
__sb_end_write() if it sees ->frozen, but if it migrates
to another CPU before percpu_counter_dec(), sb_wait_write()
can wrongly succeed if there is another task which holds
the same "semaphore": sb_wait_write() can miss the result
of the previous percpu_counter_inc() but see the result
of this percpu_counter_dec().
- As Dave Hansen reports, it is suboptimal. The trivial
microbenchmark that writes to a tmpfs file in a loop runs
12% faster if we change this code to rely on RCU and kill
the memory barriers.
- This code doesn't look simple. It would be better to rely
on the generic locking code.
According to Dave, this change adds the same performance
improvement.
Note: with this change both freeze_super() and thaw_super() will do
synchronize_sched_expedited() 3 times. This is just ugly. But:
- This will be "fixed" by the rcu_sync changes we are going
to merge. After that freeze_super()->percpu_down_write()
will use synchronize_sched(), and thaw_super() won't use
synchronize() at all.
This doesn't need any changes in fs/super.c.
- Once we merge rcu_sync changes, we can also change super.c
so that all wb_write->rw_sem's will share the single ->rss
in struct sb_writes, then freeze_super() will need only one
synchronize_sched().
Signed-off-by: Oleg Nesterov <oleg@redhat.com >
Reviewed-by: Jan Kara <jack@suse.com >
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Oleg Nesterov
8129ed2964