Re: pgsql: Move each SLRU's lwlocks to a separate tranche.

On 2015-11-12 19:59:54 +0000, Robert Haas wrote:
> Move each SLRU's lwlocks to a separate tranche.
>
> This makes it significantly easier to identify these lwlocks in
> LWLOCK_STATS or Trace_lwlocks output.  It's also arguably better
> from a modularity standpoint, since lwlock.c no longer needs to
> know anything about the LWLock needs of the higher-level SLRU
> facility.
>
> Ildus Kurbangaliev, reviewd by Álvaro Herrera and by me.

Before this commit the lwlocks were cacheline aligned, but that's not
the case anymore afterwards; afaics. I think that should be fixed? I
guess it'd be good to avoid duplicating the code for aligning, so maybe
we ought to add a ShmemAllocAligned or something?

Greetings,

Andres Freund