Make taskstats round statistics down to nearest 1k bytes/events

Even with just the interface limited to admin, there really is little to
reason to give byte-per-byte counts for taskstats.  So round it down to
something less intrusive.

Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 24dc60d9fa1f2c09de3dcb12ac33e51a7fd22562..5bbfac85866e7c333657da55e02637a135192ac8 100644 (file)
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -78,6 +78,7 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
 
 #define KB 1024
 #define MB (1024*KB)
+#define KB_MASK (~(KB-1))
 /*
  * fill in extended accounting fields
  */
@@ -95,14 +96,14 @@ void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
                stats->hiwater_vm    = get_mm_hiwater_vm(mm)  * PAGE_SIZE / KB;
                mmput(mm);
        }
-       stats->read_char        = p->ioac.rchar;
-       stats->write_char       = p->ioac.wchar;
-       stats->read_syscalls    = p->ioac.syscr;
-       stats->write_syscalls   = p->ioac.syscw;
+       stats->read_char        = p->ioac.rchar & KB_MASK;
+       stats->write_char       = p->ioac.wchar & KB_MASK;
+       stats->read_syscalls    = p->ioac.syscr & KB_MASK;
+       stats->write_syscalls   = p->ioac.syscw & KB_MASK;
 #ifdef CONFIG_TASK_IO_ACCOUNTING
-       stats->read_bytes       = p->ioac.read_bytes;
-       stats->write_bytes      = p->ioac.write_bytes;
-       stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;
+       stats->read_bytes       = p->ioac.read_bytes & KB_MASK;
+       stats->write_bytes      = p->ioac.write_bytes & KB_MASK;
+       stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
 #else
        stats->read_bytes       = 0;
        stats->write_bytes      = 0;