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Subject[PATCH 33/34] mm: cart-r.patch
Date

From: Peter Zijlstra <a.p.zijlstra@chello.nl>

Another CART based policy, this one extends CART to handle cyclic access.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Marcelo Tosatti <marcelo.tosatti@cyclades.com>

---
include/linux/mm_cart_data.h | 8 ++++
include/linux/mm_cart_policy.h | 7 +++
include/linux/mm_page_replace.h | 2 -
include/linux/mm_page_replace_data.h | 2 -
mm/Kconfig | 6 +++
mm/Makefile | 1
mm/cart.c | 63 ++++++++++++++++++++++++++++++-----
7 files changed, 78 insertions(+), 11 deletions(-)
Index: linux-2.6-git/include/linux/mm_cart_data.h
===================================================================
--- linux-2.6-git.orig/include/linux/mm_cart_data.h
+++ linux-2.6-git/include/linux/mm_cart_data.h
@@ -13,11 +13,15 @@ struct page_replace_data {
unsigned long nr_T2;
unsigned long nr_shortterm;
unsigned long nr_p;
+#if defined CONFIG_MM_POLICY_CART_R
+ unsigned long nr_r;
+#endif
unsigned long flags;
};

#define CART_RECLAIMED_T1 0
#define CART_SATURATED 1
+#define CART_CYCLIC 2

#define ZoneReclaimedT1(z) test_bit(CART_RECLAIMED_T1, &((z)->policy.flags))
#define SetZoneReclaimedT1(z) __set_bit(CART_RECLAIMED_T1, &((z)->policy.flags))
@@ -27,5 +31,9 @@ struct page_replace_data {
#define SetZoneSaturated(z) __set_bit(CART_SATURATED, &((z)->policy.flags))
#define TestClearZoneSaturated(z) __test_and_clear_bit(CART_SATURATED, &((z)->policy.flags))

+#define ZoneCyclic(z) test_bit(CART_CYCLIC, &((z)->policy.flags))
+#define SetZoneCyclic(z) __set_bit(CART_CYCLIC, &((z)->policy.flags))
+#define ClearZoneCyclic(z) __clear_bit(CART_CYCLIC, &((z)->policy.flags))
+
#endif /* __KERNEL__ */
#endif /* _LINUX_CART_DATA_H_ */
Index: linux-2.6-git/include/linux/mm_page_replace.h
===================================================================
--- linux-2.6-git.orig/include/linux/mm_page_replace.h
+++ linux-2.6-git/include/linux/mm_page_replace.h
@@ -116,7 +116,7 @@ static inline int page_replace_isolate(s
#include <linux/mm_use_once_policy.h>
#elif defined CONFIG_MM_POLICY_CLOCKPRO
#include <linux/mm_clockpro_policy.h>
-#elif defined CONFIG_MM_POLICY_CART
+#elif defined CONFIG_MM_POLICY_CART || defined CONFIG_MM_POLICY_CART_R
#include <linux/mm_cart_policy.h>
#else
#error no mm policy
Index: linux-2.6-git/include/linux/mm_page_replace_data.h
===================================================================
--- linux-2.6-git.orig/include/linux/mm_page_replace_data.h
+++ linux-2.6-git/include/linux/mm_page_replace_data.h
@@ -7,7 +7,7 @@
#include <linux/mm_use_once_data.h>
#elif defined CONFIG_MM_POLICY_CLOCKPRO
#include <linux/mm_clockpro_data.h>
-#elif defined CONFIG_MM_POLICY_CART
+#elif defined CONFIG_MM_POLICY_CART || defined CONFIG_MM_POLICY_CART_R
#include <linux/mm_cart_data.h>
#else
#error no mm policy
Index: linux-2.6-git/mm/Kconfig
===================================================================
--- linux-2.6-git.orig/mm/Kconfig
+++ linux-2.6-git/mm/Kconfig
@@ -152,6 +152,12 @@ config MM_POLICY_CART
help
This option selects a CART based policy

+config MM_POLICY_CART_R
+ bool "CART-r"
+ help
+ This option selects a CART based policy modified to handle cyclic
+ access patterns.
+
endchoice

#
Index: linux-2.6-git/mm/cart.c
===================================================================
--- linux-2.6-git.orig/mm/cart.c
+++ linux-2.6-git/mm/cart.c
@@ -69,6 +69,9 @@ void __init page_replace_init_zone(struc
zone->policy.nr_T2 = 0;
zone->policy.nr_shortterm = 0;
zone->policy.nr_p = 0;
+#if defined CONFIG_MM_POLICY_CART_R
+ zone->policy.nr_r = 0;
+#endif
zone->policy.flags = 0;
}

@@ -166,6 +169,30 @@ static inline void __cart_p_dec(struct z
zone->policy.nr_p = 0UL;
}

+#if defined CONFIG_MM_POLICY_CART_R
+static inline void __cart_r_inc(struct zone *zone)
+{
+ unsigned long ratio;
+ ratio = (cart_longterm(zone) / (zone->policy.nr_shortterm + 1)) ?: 1;
+ zone->policy.nr_r += ratio;
+ if (zone->policy.nr_r > cart_c(zone))
+ zone->policy.nr_r = cart_c(zone);
+}
+
+static inline void __cart_r_dec(struct zone *zone)
+{
+ unsigned long ratio;
+ ratio = (zone->policy.nr_shortterm / (cart_longterm(zone) + 1)) ?: 1;
+ if (zone->policy.nr_r > ratio)
+ zone->policy.nr_r -= ratio;
+ else
+ zone->policy.nr_r = 0UL;
+}
+#else
+#define __cart_r_inc(z) do { } while (0)
+#define __cart_r_dec(z) do { } while (0)
+#endif
+
static unsigned long list_count(struct list_head *list, int PG_flag, int result)
{
unsigned long nr = 0;
@@ -236,6 +263,8 @@ void __page_replace_add(struct zone *zon

if (rflags & NR_found) {
SetPageLongTerm(page);
+ __cart_r_dec(zone);
+
rflags &= NR_listid;
if (rflags == NR_b1) {
__cart_p_inc(zone);
@@ -246,6 +275,7 @@ void __page_replace_add(struct zone *zon
/* ++cart_longterm(zone); */
} else {
ClearPageLongTerm(page);
+ __cart_r_inc(zone);
++zone->policy.nr_shortterm;
}
SetPageT1(page);
@@ -454,19 +484,28 @@ static int isolate_pages(struct zone *zo

static inline int cart_reclaim_T1(struct zone *zone)
{
+ int ret = 0;
int t1 = zone->policy.nr_T1 > zone->policy.nr_p;
int sat = TestClearZoneSaturated(zone);
int rec = ZoneReclaimedT1(zone);
+#if defined CONFIG_MM_POLICY_CART_R
+ int cyc = zone->policy.nr_r < cart_longterm(zone);

- if (t1) {
- if (sat && rec)
- return 0;
- return 1;
- }
+ t1 |= cyc;
+#endif

- if (sat && !rec)
- return 1;
- return 0;
+ if ((t1 && !(rec && sat)) ||
+ (!t1 && (!rec && sat)))
+ ret = 1;
+
+#if defined CONFIG_MM_POLICY_CART_R
+ if (ret && cyc)
+ SetZoneCyclic(zone);
+ else
+ ClearZoneCyclic(zone);
+#endif
+
+ return ret;
}


@@ -642,7 +681,10 @@ void page_replace_zoneinfo(struct zone *
"\n T2 %lu"
"\n shortterm %lu"
"\n p %lu"
- "\n flags %lu"
+#if defined CONFIG_MM_POLICY_CART_R
+ "\n r %lu"
+#endif
+ "\n flags %lx"
"\n scanned %lu"
"\n spanned %lu"
"\n present %lu",
@@ -654,6 +696,9 @@ void page_replace_zoneinfo(struct zone *
zone->policy.nr_T2,
zone->policy.nr_shortterm,
zone->policy.nr_p,
+#if defined CONFIG_MM_POLICY_CART_R
+ zone->policy.nr_r,
+#endif
zone->policy.flags,
zone->pages_scanned,
zone->spanned_pages,
Index: linux-2.6-git/include/linux/mm_cart_policy.h
===================================================================
--- linux-2.6-git.orig/include/linux/mm_cart_policy.h
+++ linux-2.6-git/include/linux/mm_cart_policy.h
@@ -82,6 +82,13 @@ static inline void page_replace_remove(s

static inline int page_replace_reclaimable(struct page *page)
{
+#if defined CONFIG_MM_POLICY_CART_R
+ if (PageNew(page) && ZoneCyclic(page_zone(page))) {
+ ClearPageNew(page);
+ return RECLAIM_OK;
+ }
+#endif
+
if (page_referenced(page, 1, 0))
return RECLAIM_ACTIVATE;

Index: linux-2.6-git/mm/Makefile
===================================================================
--- linux-2.6-git.orig/mm/Makefile
+++ linux-2.6-git/mm/Makefile
@@ -15,6 +15,7 @@ obj-y := bootmem.o filemap.o mempool.o
obj-$(CONFIG_MM_POLICY_USEONCE) += useonce.o
obj-$(CONFIG_MM_POLICY_CLOCKPRO) += nonresident.o clockpro.o
obj-$(CONFIG_MM_POLICY_CART) += nonresident-cart.o cart.o
+obj-$(CONFIG_MM_POLICY_CART_R) += nonresident-cart.o cart.o

obj-$(CONFIG_SWAP) += page_io.o swap_state.o swapfile.o thrash.o
obj-$(CONFIG_HUGETLBFS) += hugetlb.o
-
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