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authorAndrea Righi <righi.andrea@gmail.com>2008-07-27 19:29:15 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-27 20:58:20 +0400
commit5995477ab7f3522c497c9c4a1c55373e9d655574 (patch)
treea147fb61642a7ac5441855964eb97a2ff1e37202 /fs
parent605ccb73f6a1c891a16268b3a2923208fc637958 (diff)
downloadlinux-5995477ab7f3522c497c9c4a1c55373e9d655574.tar.xz
task IO accounting: improve code readability
Put all i/o statistics in struct proc_io_accounting and use inline functions to initialize and increment statistics, removing a lot of single variable assignments. This also reduces the kernel size as following (with CONFIG_TASK_XACCT=y and CONFIG_TASK_IO_ACCOUNTING=y). text data bss dec hex filename 11651 0 0 11651 2d83 kernel/exit.o.before 11619 0 0 11619 2d63 kernel/exit.o.after 10886 132 136 11154 2b92 kernel/fork.o.before 10758 132 136 11026 2b12 kernel/fork.o.after 3082029 807968 4818600 8708597 84e1f5 vmlinux.o.before 3081869 807968 4818600 8708437 84e155 vmlinux.o.after Signed-off-by: Andrea Righi <righi.andrea@gmail.com> Acked-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/proc/base.c57
1 files changed, 16 insertions, 41 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index e74308bdabd3..3d94906c7aa8 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -53,6 +53,7 @@
#include <linux/time.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
+#include <linux/task_io_accounting_ops.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/file.h>
@@ -2402,44 +2403,17 @@ static int proc_base_fill_cache(struct file *filp, void *dirent,
#ifdef CONFIG_TASK_IO_ACCOUNTING
static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
{
- u64 rchar, wchar, syscr, syscw;
- struct task_io_accounting ioac;
-
- rchar = task->rchar;
- wchar = task->wchar;
- syscr = task->syscr;
- syscw = task->syscw;
- memcpy(&ioac, &task->ioac, sizeof(ioac));
-
- if (whole) {
- unsigned long flags;
-
- if (lock_task_sighand(task, &flags)) {
- struct signal_struct *sig = task->signal;
- struct task_struct *t = task;
-
- rchar += sig->rchar;
- wchar += sig->wchar;
- syscr += sig->syscr;
- syscw += sig->syscw;
-
- ioac.read_bytes += sig->ioac.read_bytes;
- ioac.write_bytes += sig->ioac.write_bytes;
- ioac.cancelled_write_bytes +=
- sig->ioac.cancelled_write_bytes;
- while_each_thread(task, t) {
- rchar += t->rchar;
- wchar += t->wchar;
- syscr += t->syscr;
- syscw += t->syscw;
-
- ioac.read_bytes += t->ioac.read_bytes;
- ioac.write_bytes += t->ioac.write_bytes;
- ioac.cancelled_write_bytes +=
- t->ioac.cancelled_write_bytes;
- }
- unlock_task_sighand(task, &flags);
- }
+ struct proc_io_accounting acct = task->ioac;
+ unsigned long flags;
+
+ if (whole && lock_task_sighand(task, &flags)) {
+ struct task_struct *t = task;
+
+ task_io_accounting_add(&acct, &task->signal->ioac);
+ while_each_thread(task, t)
+ task_io_accounting_add(&acct, &t->ioac);
+
+ unlock_task_sighand(task, &flags);
}
return sprintf(buffer,
"rchar: %llu\n"
@@ -2449,9 +2423,10 @@ static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
"read_bytes: %llu\n"
"write_bytes: %llu\n"
"cancelled_write_bytes: %llu\n",
- rchar, wchar, syscr, syscw,
- ioac.read_bytes, ioac.write_bytes,
- ioac.cancelled_write_bytes);
+ acct.chr.rchar, acct.chr.wchar,
+ acct.chr.syscr, acct.chr.syscw,
+ acct.blk.read_bytes, acct.blk.write_bytes,
+ acct.blk.cancelled_write_bytes);
}
static int proc_tid_io_accounting(struct task_struct *task, char *buffer)