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SubjectRe: [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.


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