linux-kernel - Re: [PATCH 5/7] Add /proc trigger for memory compaction

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: <alpine.DEB.2.00.1001131518240.10201@chino.kir.corp.google.com>
Date:	Wed, 13 Jan 2010 15:23:44 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Mel Gorman <mel@....ul.ie>
cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 5/7] Add /proc trigger for memory compaction

On Thu, 7 Jan 2010, David Rientjes wrote:

> > diff --git a/include/linux/compaction.h b/include/linux/compaction.h
> > index 6201371..5965ef2 100644
> > --- a/include/linux/compaction.h
> > +++ b/include/linux/compaction.h
> > @@ -5,4 +5,9 @@
> >  #define COMPACT_INCOMPLETE	0
> >  #define COMPACT_COMPLETE	1
> >  
> > +#ifdef CONFIG_MIGRATION
> > +extern int sysctl_compaction_handler(struct ctl_table *table, int write,
> > +			void __user *buffer, size_t *length, loff_t *ppos);
> > +#endif /* CONFIG_MIGRATION */
> > +
> >  #endif /* _LINUX_COMPACTION_H */

This should be CONFIG_COMPACTION since mm/compaction.c won't be compiled 
without it; the later additions to this ifdef, fragmentation_index() and 
try_to_compact_pages(), can also be under CONFIG_COMPACTION since neither 
are used outside of the compaction core directly (__fragmentation_index() 
from vmstat uses its wrapped function at file scope).

> > diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> > index 8a68b24..6202e95 100644
> > --- a/kernel/sysctl.c
> > +++ b/kernel/sysctl.c
> > @@ -50,6 +50,7 @@
> >  #include <linux/ftrace.h>
> >  #include <linux/slow-work.h>
> >  #include <linux/perf_event.h>
> > +#include <linux/compaction.h>
> >  
> >  #include <asm/uaccess.h>
> >  #include <asm/processor.h>
> > @@ -80,6 +81,7 @@ extern int pid_max;
> >  extern int min_free_kbytes;
> >  extern int pid_max_min, pid_max_max;
> >  extern int sysctl_drop_caches;
> > +extern int sysctl_compact_node;
> >  extern int percpu_pagelist_fraction;
> >  extern int compat_log;
> >  extern int latencytop_enabled;
> > @@ -1109,6 +1111,15 @@ static struct ctl_table vm_table[] = {
> >  		.mode		= 0644,
> >  		.proc_handler	= drop_caches_sysctl_handler,
> >  	},
> > +#ifdef CONFIG_MIGRATION
> > +	{
> > +		.procname	= "compact_node",
> > +		.data		= &sysctl_compact_node,
> > +		.maxlen		= sizeof(int),
> > +		.mode		= 0644,
> 
> This should only need 0200?
> 

This needs to be CONFIG_COMPACTION as well, we won't have the handler 
without mm/compaction.c.
--
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/