path: root/init
diff options
authorShailabh Nagar <>2006-07-14 00:24:36 -0700
committerLinus Torvalds <>2006-07-14 21:53:56 -0700
commitca74e92b4698276b6696f15a801759f50944f387 (patch)
tree26f0de66d8207608e07ee22389bfc173e773c0c2 /init
parente8f4d97e1b58b50ad6449bb2d35e6632c0236abd (diff)
[PATCH] per-task-delay-accounting: setup
Initialization code related to collection of per-task "delay" statistics which measure how long it had to wait for cpu, sync block io, swapping etc. The collection of statistics and the interface are in other patches. This patch sets up the data structures and allows the statistics collection to be disabled through a kernel boot parameter. Signed-off-by: Shailabh Nagar <> Signed-off-by: Balbir Singh <> Cc: Jes Sorensen <> Cc: Peter Chubb <> Cc: Erich Focht <> Cc: Levent Serinol <> Cc: Jay Lan <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'init')
2 files changed, 12 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index a5b073a103e7..90498a3e53da 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -158,6 +158,16 @@ config BSD_PROCESS_ACCT_V3
for processing it. A preliminary version of these tools is available
at <>.
+ bool "Enable per-task delay accounting (EXPERIMENTAL)"
+ help
+ Collect information on time spent by a task waiting for system
+ resources like cpu, synchronous block I/O completion and swapping
+ in pages. Such statistics can help in setting a task's priorities
+ relative to other tasks for cpu, io, rss limits etc.
+ Say N if unsure.
config SYSCTL
bool "Sysctl support" if EMBEDDED
default y
diff --git a/init/main.c b/init/main.c
index 628b8e9e841a..9e8e8c152142 100644
--- a/init/main.c
+++ b/init/main.c
@@ -41,6 +41,7 @@
#include <linux/cpu.h>
#include <linux/cpuset.h>
#include <linux/efi.h>
+#include <linux/delayacct.h>
#include <linux/unistd.h>
#include <linux/rmap.h>
#include <linux/mempolicy.h>
@@ -574,6 +575,7 @@ asmlinkage void __init start_kernel(void)
+ delayacct_init();