lkml.org 
[lkml]   [2002]   [Sep]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC] [PATCH] Include LRU in page count
Daniel Phillips wrote:
>
> ...
> I'm looking at your spinlock_irq now and thinking the _irq part could
> possibly be avoided. Can you please remind me of the motivation for this -
> was it originally intended to address the same race we've been working on
> here?
>

scalability, mainly. If the CPU holding the lock takes an interrupt,
all the other CPUs get to spin until the handler completes. I measured
a 30% reducton in contention from this.

Not a generally justifiable trick, but this is a heavily-used lock.
All the new games in refill_inactive() are there to minimise the
interrupt-off time.
-
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/

\
 
 \ /
  Last update: 2005-03-22 13:22    [W:0.129 / U:1.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site