getrusage(): fill ru_inblock and ru_oublock fields if possible

If CONFIG_TASK_IO_ACCOUNTING is defined, we update io accounting counters for
each task.

This patch permits reporting of values using the well known getrusage()
syscall, filling ru_inblock and ru_oublock instead of null values.

As TASK_IO_ACCOUNTING currently counts bytes counts, we approximate blocks
count doing : nr_blocks = nr_bytes / 512

Example of use :
----------------------
After patch is applied, /usr/bin/time command can now give a good
approximation of IO that the process had to do.

$ /usr/bin/time grep tototo /usr/include/*
Command exited with non-zero status 1
0.00user 0.02system 0:02.11elapsed 1%CPU (0avgtext+0avgdata 0maxresident)k
24288inputs+0outputs (0major+259minor)pagefaults 0swaps

$ /usr/bin/time dd if=/dev/zero of=/tmp/testfile count=1000
1000+0 enregistrements lus
1000+0 enregistrements écrits
512000 octets (512 kB) copiés, 0,00326601 seconde, 157 MB/s
0.00user 0.00system 0:00.00elapsed 80%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+3000outputs (0major+299minor)pagefaults 0swaps

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/include/linux/task_io_accounting_ops.h b/include/linux/task_io_accounting_ops.h
index df2a319106b2..1218733ec6b5 100644
--- a/include/linux/task_io_accounting_ops.h
+++ b/include/linux/task_io_accounting_ops.h
@@ -10,11 +10,29 @@ static inline void task_io_account_read(size_t bytes)
 	current->ioac.read_bytes += bytes;
 }
 
+/*
+ * We approximate number of blocks, because we account bytes only.
+ * A 'block' is 512 bytes
+ */
+static inline unsigned long task_io_get_inblock(const struct task_struct *p)
+{
+	return p->ioac.read_bytes >> 9;
+}
+
 static inline void task_io_account_write(size_t bytes)
 {
 	current->ioac.write_bytes += bytes;
 }
 
+/*
+ * We approximate number of blocks, because we account bytes only.
+ * A 'block' is 512 bytes
+ */
+static inline unsigned long task_io_get_oublock(const struct task_struct *p)
+{
+	return p->ioac.write_bytes >> 9;
+}
+
 static inline void task_io_account_cancelled_write(size_t bytes)
 {
 	current->ioac.cancelled_write_bytes += bytes;
@@ -31,10 +49,20 @@ static inline void task_io_account_read(size_t bytes)
 {
 }
 
+static inline unsigned long task_io_get_inblock(const struct task_struct *p)
+{
+	return 0;
+}
+
 static inline void task_io_account_write(size_t bytes)
 {
 }
 
+static inline unsigned long task_io_get_oublock(const struct task_struct *p)
+{
+	return 0;
+}
+
 static inline void task_io_account_cancelled_write(size_t bytes)
 {
 }