It is beneficial to know about the contiguous memory segments
available on a system and the number of allocations failing
for each page order.
This patch adds details per order statistics to /proc/meminfo
so the current memory use can be determined.
Also adds counters to /proc/vmstat to show allocation
failures for each page order.
Signed-off-by: Christoph Laeter <cl@xxxxxxxxx>
Index: linux/include/linux/mmzone.h
===================================================================
--- linux.orig/include/linux/mmzone.h
+++ linux/include/linux/mmzone.h
@@ -185,6 +185,10 @@ enum node_stat_item {
NR_VMSCAN_IMMEDIATE, /* Prioritise for reclaim when writeback ends */
NR_DIRTIED, /* page dirtyings since bootup */
NR_WRITTEN, /* page writings since bootup */
+#ifdef CONFIG_ORDER_STATS
+ NR_ORDER,
+ NR_ORDER_MAX = NR_ORDER + MAX_ORDER - 1,
+#endif
NR_VM_NODE_STAT_ITEMS
};
Index: linux/mm/page_alloc.c
===================================================================
--- linux.orig/mm/page_alloc.c
+++ linux/mm/page_alloc.c
@@ -828,6 +828,10 @@ static inline void __free_one_page(struc
VM_BUG_ON_PAGE(pfn & ((1 << order) - 1), page);
VM_BUG_ON_PAGE(bad_range(zone, page), page);
+#ifdef CONFIG_ORDER_STATS
+ dec_node_page_state(page, NR_ORDER + order);
+#endif
+
continue_merging:
while (order < max_order - 1) {
buddy_pfn = __find_buddy_pfn(pfn, order);
@@ -1285,6 +1289,9 @@ static void __init __free_pages_boot_cor
page_zone(page)->managed_pages += nr_pages;
set_page_refcounted(page);
__free_pages(page, order);
+#ifdef CONFIG_ORDER_STATS
+ inc_node_page_state(page, NR_ORDER + order);
+#endif
}
#if defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) || \
@@ -1855,6 +1862,9 @@ struct page *__rmqueue_smallest(struct z
rmv_page_order(page);
area->nr_free--;
expand(zone, page, order, current_order, area, migratetype);
+#ifdef CONFIG_ORDER_STATS
+ inc_node_page_state(page, NR_ORDER + order);
+#endif
set_pcppage_migratetype(page, migratetype);
return page;
}
@@ -4169,6 +4179,11 @@ nopage:
fail:
warn_alloc(gfp_mask, ac->nodemask,
"page allocation failure: order:%u", order);
+
+#ifdef CONFIG_ORDER_STATS
+ count_vm_event(ORDER0_ALLOC_FAIL + order);
+#endif
+
got_pg:
return page;
}
Index: linux/fs/proc/meminfo.c
===================================================================
--- linux.orig/fs/proc/meminfo.c
+++ linux/fs/proc/meminfo.c
@@ -51,6 +51,7 @@ static int meminfo_proc_show(struct seq_
long available;
unsigned long pages[NR_LRU_LISTS];
int lru;
+ int order;
si_meminfo(&i);
si_swapinfo(&i);
@@ -155,6 +156,11 @@ static int meminfo_proc_show(struct seq_
global_zone_page_state(NR_FREE_CMA_PAGES));
#endif
+#ifdef CONFIG_ORDER_STATS
+ for (order= 0; order < MAX_ORDER; order++)
+ seq_printf(m, "Order%2d Pages: %5lu\n",
+ order, global_node_page_state(NR_ORDER + order));
+#endif
hugetlb_report_meminfo(m);
arch_report_meminfo(m);
Index: linux/mm/Kconfig
===================================================================
--- linux.orig/mm/Kconfig
+++ linux/mm/Kconfig
@@ -752,6 +752,15 @@ config PERCPU_STATS
information includes global and per chunk statistics, which can
be used to help understand percpu memory usage.
+config ORDER_STATS
+ bool "Statistics for different sized allocations"
+ default n
+ help
+ Create statistics about the contiguous memory segments allocated
+ through the page allocator. This creates statistics about the
+ memory segments in use in /proc/meminfo and the node meminfo files
+ as well as allocation failure statistics in /proc/vmstat.
+
config GUP_BENCHMARK
bool "Enable infrastructure for get_user_pages_fast() benchmarking"
default n
Index: linux/include/linux/vm_event_item.h
===================================================================
--- linux.orig/include/linux/vm_event_item.h
+++ linux/include/linux/vm_event_item.h
@@ -111,6 +111,10 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS
SWAP_RA,
SWAP_RA_HIT,
#endif
+#ifdef CONFIG_ORDER_STATS
+ ORDER0_ALLOC_FAIL,
+ ORDER_MAX_FAIL = ORDER0_ALLOC_FAIL + MAX_ORDER -1,
+#endif
NR_VM_EVENT_ITEMS
};
Index: linux/mm/vmstat.c
===================================================================
--- linux.orig/mm/vmstat.c
+++ linux/mm/vmstat.c
@@ -1289,6 +1289,52 @@ const char * const vmstat_text[] = {
"swap_ra",
"swap_ra_hit",
#endif
+#ifdef CONFIG_ORDER_STATS
+ "order0_failure",
+ "order1_failure",
+ "order2_failure",
+ "order3_failure",
+ "order4_failure",
+ "order5_failure",
+ "order6_failure",
+ "order7_failure",
+ "order8_failure",
+ "order9_failure",
+ "order10_failure",
+#ifdef CONFIG_FORCE_MAX_ZONEORDER
+#if MAX_ORDER > 11
+ "order11_failure"
+#endif
+#if MAX_ORDER > 12
+ "order12_failure"
+#endif
+#if MAX_ORDER > 13
+ "order13_failure"
+#endif
+#if MAX_ORDER > 14
+ "order14_failure"
+#endif
+#if MAX_ORDER > 15
+ "order15_failure"
+#endif
+#if MAX_ORDER > 16
+ "order16_failure"
+#endif
+#if MAX_ORDER > 17
+ "order17_failure"
+#endif
+#if MAX_ORDER > 18
+ "order18_failure"
+#endif
+#if MAX_ORDER > 19
+ "order19_failure"
+#endif
+#if MAX_ORDER > 20
+#error Please add more lines...
+#endif
+
+#endif /* CONFIG_FORCE_MAX_ZONEORDER */
+#endif /* CONFIG_ORDER_STATS */
#endif /* CONFIG_VM_EVENTS_COUNTERS */
};
#endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA */
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