Instrument __alloc_pages with a performance counter.
Allows the investigation of various allocation scenarios on page allocator
performance.
Signed-off-by: Christoph Lameter <[email protected]>
---
include/linux/perf.h | 1 +
kernel/perf.c | 1 +
mm/page_alloc.c | 3 +++
3 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/include/linux/perf.h b/include/linux/perf.h
index 2958c81..795b7ec 100644
--- a/include/linux/perf.h
+++ b/include/linux/perf.h
@@ -15,6 +15,7 @@
enum pc_item {
PC_UPDATE_PROCESS_TIMES,
+ PC_ALLOC_PAGES,
NR_PC_ITEMS
};
diff --git a/kernel/perf.c b/kernel/perf.c
index 14cba9c..dd4e850 100644
--- a/kernel/perf.c
+++ b/kernel/perf.c
@@ -22,6 +22,7 @@ static int unsynced_get_cycles = 1;
const char *var_id[NR_PC_ITEMS] = {
"update_process_times",
+ "__alloc_pages"
};
struct perf_counter {
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3da85b8..69d34b7 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -41,6 +41,7 @@
#include <linux/pfn.h>
#include <linux/backing-dev.h>
#include <linux/fault-inject.h>
+#include <linux/perf.h>
#include <asm/tlbflush.h>
#include <asm/div64.h>
@@ -1223,6 +1224,7 @@ struct page * fastcall
__alloc_pages(gfp_t gfp_mask, unsigned int order,
struct zonelist *zonelist)
{
+ INIT_PC(pc);
const gfp_t wait = gfp_mask & __GFP_WAIT;
struct zone **z;
struct page *page;
@@ -1387,6 +1389,7 @@ nopage:
show_mem();
}
got_pg:
+ pc_bytes(&pc, PAGE_SIZE << order, PC_ALLOC_PAGES);
return page;
}
--
1.5.2.4
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