On 02/21/2019 09:14 AM, Will Deacon wrote:
> On Wed, Feb 13, 2019 at 05:00:17PM -0500, Waiman Long wrote:
>> Modify __down_read_trylock() to optimize for an unlocked rwsem and make
>> it generate slightly better code.
>>
>> Before this patch, down_read_trylock:
>>
>>0x <+0>:
Do you think that we should fix this by identifying hardware that needs
the delays and adding the delays there?
In my opinion, adding mb() to the port accessing functions is safer - it
is 6 line patch.
Reading all the hardware manuals is time consuming and hardly anyone will
do it for 25
On Wed, Feb 13, 2019 at 05:00:17PM -0500, Waiman Long wrote:
> Modify __down_read_trylock() to optimize for an unlocked rwsem and make
> it generate slightly better code.
>
> Before this patch, down_read_trylock:
>
>0x <+0>: callq 0x5
>0x0005 <+5>:
On Thu 21-02-19 01:23:50, Meelis Roos wrote:
> > > First, I found out that both the problematic alphas had memory compaction
> > > and
> > > page migration and bounce buffers turned on, and working alphas had them
> > > off.
> > >
> > > Next, turing off these options makes the problematic
