* [PATCH] mm: compare MIGRATE_ISOLATE selectively
@ 2012-12-20 5:25 Minchan Kim
2012-12-20 15:49 ` Michal Nazarewicz
0 siblings, 1 reply; 5+ messages in thread
From: Minchan Kim @ 2012-12-20 5:25 UTC (permalink / raw)
To: Andrew Morton; +Cc: linux-mm, linux-kernel, Minchan Kim
Now mm several functions test MIGRATE_ISOLATE and some of those
are hotpath but MIGRATE_ISOLATE is used only if we enable
CONFIG_MEMORY_ISOLATION(ie, CMA, memory-hotplug and memory-failure)
which are not common config option. So let's not add unnecessary
overhead and code.
Signed-off-by: Minchan Kim <minchan@kernel.org>
---
include/linux/mmzone.h | 2 ++
include/linux/page-isolation.h | 19 +++++++++++++++++++
mm/compaction.c | 6 +++++-
mm/page_alloc.c | 16 ++++++++++------
mm/vmstat.c | 2 ++
5 files changed, 38 insertions(+), 7 deletions(-)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 73b64a3..4f4c8c2 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -57,7 +57,9 @@ enum {
*/
MIGRATE_CMA,
#endif
+#ifdef CONFIG_MEMORY_ISOLATION
MIGRATE_ISOLATE, /* can't allocate from here */
+#endif
MIGRATE_TYPES
};
diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
index a92061e..4ada4ef 100644
--- a/include/linux/page-isolation.h
+++ b/include/linux/page-isolation.h
@@ -1,6 +1,25 @@
#ifndef __LINUX_PAGEISOLATION_H
#define __LINUX_PAGEISOLATION_H
+#ifdef CONFIG_MEMORY_ISOLATION
+static inline bool page_isolated_pageblock(struct page *page)
+{
+ return get_pageblock_migratetype(page) == MIGRATE_ISOLATE;
+}
+static inline bool mt_isolated_pageblock(int migratetype)
+{
+ return migratetype == MIGRATE_ISOLATE;
+}
+#else
+static inline bool page_isolated_pageblock(struct page *page)
+{
+ return false;
+}
+static inline bool mt_isolated_pageblock(int migratetype)
+{
+ return false;
+}
+#endif
bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
bool skip_hwpoisoned_pages);
diff --git a/mm/compaction.c b/mm/compaction.c
index 70f4443..dc2a6c7 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -15,6 +15,7 @@
#include <linux/sysctl.h>
#include <linux/sysfs.h>
#include <linux/balloon_compaction.h>
+#include <linux/page-isolation.h>
#include "internal.h"
#ifdef CONFIG_COMPACTION
@@ -215,7 +216,10 @@ static bool suitable_migration_target(struct page *page)
int migratetype = get_pageblock_migratetype(page);
/* Don't interfere with memory hot-remove or the min_free_kbytes blocks */
- if (migratetype == MIGRATE_ISOLATE || migratetype == MIGRATE_RESERVE)
+ if (migratetype == MIGRATE_RESERVE)
+ return false;
+
+ if (mt_isolated_pageblock(migratetype))
return false;
/* If the page is a large free page, then allow migration */
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0939417..5450815 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -668,7 +668,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
/* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
__free_one_page(page, zone, 0, mt);
trace_mm_page_pcpu_drain(page, 0, mt);
- if (likely(get_pageblock_migratetype(page) != MIGRATE_ISOLATE)) {
+ if (likely(!page_isolated_pageblock(page))) {
__mod_zone_page_state(zone, NR_FREE_PAGES, 1);
if (is_migrate_cma(mt))
__mod_zone_page_state(zone, NR_FREE_CMA_PAGES, 1);
@@ -686,7 +686,7 @@ static void free_one_page(struct zone *zone, struct page *page, int order,
zone->pages_scanned = 0;
__free_one_page(page, zone, order, migratetype);
- if (unlikely(migratetype != MIGRATE_ISOLATE))
+ if (unlikely(!mt_isolated_pageblock(migratetype)))
__mod_zone_freepage_state(zone, 1 << order, migratetype);
spin_unlock(&zone->lock);
}
@@ -914,7 +914,9 @@ static int fallbacks[MIGRATE_TYPES][4] = {
[MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_RESERVE },
#endif
[MIGRATE_RESERVE] = { MIGRATE_RESERVE }, /* Never used */
+#ifdef CONFIG_MEMORY_ISOLATION
[MIGRATE_ISOLATE] = { MIGRATE_RESERVE }, /* Never used */
+#endif
};
/*
@@ -1140,7 +1142,7 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
list_add_tail(&page->lru, list);
if (IS_ENABLED(CONFIG_CMA)) {
mt = get_pageblock_migratetype(page);
- if (!is_migrate_cma(mt) && mt != MIGRATE_ISOLATE)
+ if (!is_migrate_cma(mt) && !mt_isolated_pageblock(mt))
mt = migratetype;
}
set_freepage_migratetype(page, mt);
@@ -1324,7 +1326,7 @@ void free_hot_cold_page(struct page *page, int cold)
* excessively into the page allocator
*/
if (migratetype >= MIGRATE_PCPTYPES) {
- if (unlikely(migratetype == MIGRATE_ISOLATE)) {
+ if (unlikely(mt_isolated_pageblock(migratetype))) {
free_one_page(zone, page, 0, migratetype);
goto out;
}
@@ -1405,7 +1407,7 @@ int capture_free_page(struct page *page, int alloc_order, int migratetype)
order = page_order(page);
mt = get_pageblock_migratetype(page);
- if (mt != MIGRATE_ISOLATE) {
+ if (!mt_isolated_pageblock(mt)) {
/* Obey watermarks as if the page was being allocated */
watermark = low_wmark_pages(zone) + (1 << order);
if (!zone_watermark_ok(zone, 0, watermark, 0, 0))
@@ -1428,7 +1430,7 @@ int capture_free_page(struct page *page, int alloc_order, int migratetype)
struct page *endpage = page + (1 << order) - 1;
for (; page < endpage; page += pageblock_nr_pages) {
int mt = get_pageblock_migratetype(page);
- if (mt != MIGRATE_ISOLATE && !is_migrate_cma(mt))
+ if (!mt_isolated_pageblock(mt) && !is_migrate_cma(mt))
set_pageblock_migratetype(page,
MIGRATE_MOVABLE);
}
@@ -2937,7 +2939,9 @@ static void show_migration_types(unsigned char type)
#ifdef CONFIG_CMA
[MIGRATE_CMA] = 'C',
#endif
+#ifdef CONFIG_MEMORY_ISOLATION
[MIGRATE_ISOLATE] = 'I',
+#endif
};
char tmp[MIGRATE_TYPES + 1];
char *p = tmp;
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 58e3da5..2e6094f 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -629,7 +629,9 @@ static char * const migratetype_names[MIGRATE_TYPES] = {
#ifdef CONFIG_CMA
"CMA",
#endif
+#ifdef CONFIG_MEMORY_ISOLATION
"Isolate",
+#endif
};
static void *frag_start(struct seq_file *m, loff_t *pos)
--
1.7.9.5
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^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] mm: compare MIGRATE_ISOLATE selectively
2012-12-20 5:25 [PATCH] mm: compare MIGRATE_ISOLATE selectively Minchan Kim
@ 2012-12-20 15:49 ` Michal Nazarewicz
2012-12-21 1:09 ` Minchan Kim
0 siblings, 1 reply; 5+ messages in thread
From: Michal Nazarewicz @ 2012-12-20 15:49 UTC (permalink / raw)
To: Minchan Kim, Andrew Morton; +Cc: linux-mm, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 1438 bytes --]
On Thu, Dec 20 2012, Minchan Kim wrote:
> diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
> index a92061e..4ada4ef 100644
> --- a/include/linux/page-isolation.h
> +++ b/include/linux/page-isolation.h
> @@ -1,6 +1,25 @@
> #ifndef __LINUX_PAGEISOLATION_H
> #define __LINUX_PAGEISOLATION_H
>
> +#ifdef CONFIG_MEMORY_ISOLATION
> +static inline bool page_isolated_pageblock(struct page *page)
> +{
> + return get_pageblock_migratetype(page) == MIGRATE_ISOLATE;
> +}
> +static inline bool mt_isolated_pageblock(int migratetype)
> +{
> + return migratetype == MIGRATE_ISOLATE;
> +}
Perhaps “is_migrate_isolate” to match already existing “is_migrate_cma”?
Especially as the “mt_isolated_pageblock” sound confusing to me, it
implies that it works on pageblocks which it does not.
> +#else
> +static inline bool page_isolated_pageblock(struct page *page)
> +{
> + return false;
> +}
> +static inline bool mt_isolated_pageblock(int migratetype)
> +{
> + return false;
> +}
> +#endif
>
> bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
> bool skip_hwpoisoned_pages);
--
Best regards, _ _
.o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o
..o | Computer Science, Michał “mina86” Nazarewicz (o o)
ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--
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[-- Attachment #2.2: Type: application/pgp-signature, Size: 835 bytes --]
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] mm: compare MIGRATE_ISOLATE selectively
2012-12-20 15:49 ` Michal Nazarewicz
@ 2012-12-21 1:09 ` Minchan Kim
2012-12-21 12:46 ` Michal Nazarewicz
0 siblings, 1 reply; 5+ messages in thread
From: Minchan Kim @ 2012-12-21 1:09 UTC (permalink / raw)
To: Michal Nazarewicz; +Cc: Andrew Morton, linux-mm, linux-kernel
On Thu, Dec 20, 2012 at 04:49:44PM +0100, Michal Nazarewicz wrote:
> On Thu, Dec 20 2012, Minchan Kim wrote:
> > diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
> > index a92061e..4ada4ef 100644
> > --- a/include/linux/page-isolation.h
> > +++ b/include/linux/page-isolation.h
> > @@ -1,6 +1,25 @@
> > #ifndef __LINUX_PAGEISOLATION_H
> > #define __LINUX_PAGEISOLATION_H
> >
> > +#ifdef CONFIG_MEMORY_ISOLATION
> > +static inline bool page_isolated_pageblock(struct page *page)
> > +{
> > + return get_pageblock_migratetype(page) == MIGRATE_ISOLATE;
> > +}
> > +static inline bool mt_isolated_pageblock(int migratetype)
> > +{
> > + return migratetype == MIGRATE_ISOLATE;
> > +}
>
> Perhaps a??is_migrate_isolatea?? to match already existing a??is_migrate_cmaa???
Good poking. In fact, while I made this patch, I was very tempted by renaming
is_migrate_cma to cma_pageblock.
is_migrate_cma(mt)
I don't know who start to use "mt" instead of "migratetype" but anyway, it's
not a good idea.
is_migrate_cma(migratetype)
It's very clear for me because migratetype is per pageblock, we can know the
function works per pageblock unit.
> Especially as the a??mt_isolated_pageblocka?? sound confusing to me, it
> implies that it works on pageblocks which it does not.
-ENOPARSE.
migratetype works on pageblock.
I admit mt is really dirty but I used page_alloc.c already has lots of mt, SIGH.
How about this?
1. Let's change all "mt" with "migratetype" again.
2. use is_migrate_isolate and is_migrate_cma for "migratetype".
3. use is_migrate_isolate_page instead of page_isolated_pageblock for "page".
Okay?
>
> > +#else
> > +static inline bool page_isolated_pageblock(struct page *page)
> > +{
> > + return false;
> > +}
> > +static inline bool mt_isolated_pageblock(int migratetype)
> > +{
> > + return false;
> > +}
> > +#endif
> >
> > bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
> > bool skip_hwpoisoned_pages);
> --
> Best regards, _ _
> .o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o
> ..o | Computer Science, MichaA? a??mina86a?? Nazarewicz (o o)
> ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--
--
Kind regards,
Minchan Kim
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] mm: compare MIGRATE_ISOLATE selectively
2012-12-21 1:09 ` Minchan Kim
@ 2012-12-21 12:46 ` Michal Nazarewicz
2012-12-23 23:26 ` Minchan Kim
0 siblings, 1 reply; 5+ messages in thread
From: Michal Nazarewicz @ 2012-12-21 12:46 UTC (permalink / raw)
To: Minchan Kim; +Cc: Andrew Morton, linux-mm, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 2110 bytes --]
> On Thu, Dec 20, 2012 at 04:49:44PM +0100, Michal Nazarewicz wrote:
>> Perhaps “is_migrate_isolate” to match already existing “is_migrate_cma”?
On Fri, Dec 21 2012, Minchan Kim wrote:
> Good poking. In fact, while I made this patch, I was very tempted by renaming
> is_migrate_cma to cma_pageblock.
>
> is_migrate_cma(mt)
>
> I don't know who start to use "mt" instead of "migratetype" but anyway, it's
> not a good idea.
>
> is_migrate_cma(migratetype)
>
> It's very clear for me because migratetype is per pageblock, we can know the
> function works per pageblock unit.
>
>> Especially as the “mt_isolated_pageblock” sound confusing to me, it
>> implies that it works on pageblocks which it does not.
>
> -ENOPARSE.
>
> migratetype works on pageblock.
migratetype is a number, which can be assigned to a pageblock. In some
transitional cases, the migratetype associated with a page can differ
from the migratetype associated with the pageblock the page is in. As
such, I think it's confusing to add “pageblock” to the name of the
function which does not read migratetype from pageblock but rather
operates on the number it is provided.
> I admit mt is really dirty but I used page_alloc.c already has lots of
> mt, SIGH.
I don't really have an issue with “mt” myself, especially since the few
times “mt” is used in page_alloc.c it is a local variable which I don't
think needs a long descriptive name since context is all there.
> How about this?
>
> 1. Let's change all "mt" with "migratetype" again.
> 2. use is_migrate_isolate and is_migrate_cma for "migratetype".
> 3. use is_migrate_isolate_page instead of page_isolated_pageblock for
> "page".
Like I've said. Personally I don't really think 1 is needed, but 2 and
3 look good to me.
--
Best regards, _ _
.o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o
..o | Computer Science, Michał “mina86” Nazarewicz (o o)
ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--
[-- Attachment #2.1: Type: text/plain, Size: 0 bytes --]
[-- Attachment #2.2: Type: application/pgp-signature, Size: 835 bytes --]
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] mm: compare MIGRATE_ISOLATE selectively
2012-12-21 12:46 ` Michal Nazarewicz
@ 2012-12-23 23:26 ` Minchan Kim
0 siblings, 0 replies; 5+ messages in thread
From: Minchan Kim @ 2012-12-23 23:26 UTC (permalink / raw)
To: Michal Nazarewicz; +Cc: Andrew Morton, linux-mm, linux-kernel
On Fri, Dec 21, 2012 at 01:46:23PM +0100, Michal Nazarewicz wrote:
> > On Thu, Dec 20, 2012 at 04:49:44PM +0100, Michal Nazarewicz wrote:
> >> Perhaps a??is_migrate_isolatea?? to match already existing a??is_migrate_cmaa???
>
> On Fri, Dec 21 2012, Minchan Kim wrote:
> > Good poking. In fact, while I made this patch, I was very tempted by renaming
> > is_migrate_cma to cma_pageblock.
> >
> > is_migrate_cma(mt)
> >
> > I don't know who start to use "mt" instead of "migratetype" but anyway, it's
> > not a good idea.
> >
> > is_migrate_cma(migratetype)
> >
> > It's very clear for me because migratetype is per pageblock, we can know the
> > function works per pageblock unit.
> >
> >> Especially as the a??mt_isolated_pageblocka?? sound confusing to me, it
> >> implies that it works on pageblocks which it does not.
> >
> > -ENOPARSE.
> >
> > migratetype works on pageblock.
>
> migratetype is a number, which can be assigned to a pageblock. In some
> transitional cases, the migratetype associated with a page can differ
> from the migratetype associated with the pageblock the page is in. As
> such, I think it's confusing to add a??pageblocka?? to the name of the
> function which does not read migratetype from pageblock but rather
> operates on the number it is provided.
Fair enough.
>
> > I admit mt is really dirty but I used page_alloc.c already has lots of
> > mt, SIGH.
>
> I don't really have an issue with a??mta?? myself, especially since the few
> times a??mta?? is used in page_alloc.c it is a local variable which I don't
> think needs a long descriptive name since context is all there.
>
> > How about this?
> >
> > 1. Let's change all "mt" with "migratetype" again.
> > 2. use is_migrate_isolate and is_migrate_cma for "migratetype".
> > 3. use is_migrate_isolate_page instead of page_isolated_pageblock for
> > "page".
>
> Like I've said. Personally I don't really think 1 is needed, but 2 and
> 3 look good to me.
Okay. It would be a first patch in New Year.
Thanks for the review, Michal.
>
> --
> Best regards, _ _
> .o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o
> ..o | Computer Science, MichaA? a??mina86a?? Nazarewicz (o o)
> ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--
--
Kind regards,
Minchan Kim
--
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^ permalink raw reply [flat|nested] 5+ messages in thread
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2012-12-20 5:25 [PATCH] mm: compare MIGRATE_ISOLATE selectively Minchan Kim
2012-12-20 15:49 ` Michal Nazarewicz
2012-12-21 1:09 ` Minchan Kim
2012-12-21 12:46 ` Michal Nazarewicz
2012-12-23 23:26 ` Minchan Kim
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