lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <Pine.LNX.4.64.0708211349160.3082@schroedinger.engr.sgi.com>
Date:	Tue, 21 Aug 2007 13:51:11 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mel Gorman <mel@...net.ie>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, dkegel@...gle.com,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	David Miller <davem@...emloft.net>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [RFC 1/7] release_lru_pages(): Generic release of pages to the
 LRU

On Tue, 21 Aug 2007, Mel Gorman wrote:

> > + */
> > +void release_lru_pages(struct list_head *page_list)
> > +{
> 
> Can the migrate.c#putback_lru_pages() be replaced with this?

Correct. We can get rid of the putback_lru_pages in migrate.c 
with this.

> > +	struct page *page;
> > +	struct pagevec pvec;
> > +	struct zone *zone = NULL;
> > +
> > +	pagevec_init(&pvec, 1);
> > +	while (!list_empty(page_list)) {
> > +		page = lru_to_page(page_list);
> > +		VM_BUG_ON(PageLRU(page));
> > +		if (zone != page_zone(page)) {
> > +			if (zone)
> > +				spin_unlock_irq(&zone->lru_lock);
> > +			zone = page_zone(page);
> > +			spin_lock_irq(&zone->lru_lock);
> 
> Is this really necessary? Why situation would occur that would have a
> list of pages in multiple zones?

Because we reclaim from multiple zones and gather laundry from different 
zones.

> Also, it may be worth commenting here that __pagevec_release() is able to
> handle lists of pages in multiple zones.

Ok.

> >  			__count_zone_vm_events(PGSCAN_DIRECT, zone, nr_scan);
> >  		__count_zone_vm_events(PGSTEAL, zone, nr_freed);
> > +		local_irq_enable();
> > +		release_lru_pages(&page_list);
> >  
> 
> Separate these apart by a line. I thought the local_irq_enable() was related
> to the call to release_lru_pages(&page_list) while reading the patch
> which isn't the case at all.

Will do.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ