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 24dc60d..5bbfac8 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -78,6 +78,7 @@
#define KB 1024
#define MB (1024*KB)
+#define KB_MASK (~(KB-1))
/*
* fill in extended accounting fields
*/
@@ -95,14 +96,14 @@
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;