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Add I/O Read/Write Accounting

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Because ZFS bypasses the page cache we don't inherit per-task I/O
accounting for free.  However, the Linux kernel does provide helper
functions allow us to perform our own accounting.  These are most
commonly used for direct IO which also bypasses the page cache, but
they can be used for the common read/write call paths as well.

Signed-off-by: Pavel Snajdr <snajpa@snajpa.net>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #313
Closes #1275
This commit is contained in:
Brian Behlendorf 2013-11-15 09:59:09 -08:00
parent 29714574fa
commit e3dc14b861
2 changed files with 11 additions and 2 deletions
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1
include/sys/zpl.h
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@ -32,6 +32,7 @@
#include <linux/exportfs.h>
#include <linux/writeback.h>
#include <linux/falloc.h>
#include <linux/task_io_accounting_ops.h>
/* zpl_inode.c */
extern void zpl_vap_init(vattr_t *vap, struct inode *dir,

12
module/zfs/zpl_file.c
View File

@ -170,6 +170,7 @@ zpl_read_common(struct inode *ip, const char *buf, size_t len, loff_t pos,
uio_seg_t segment, int flags, cred_t *cr)
{
int error;
ssize_t read;
struct iovec iov;
uio_t uio;
@ -187,7 +188,10 @@ zpl_read_common(struct inode *ip, const char *buf, size_t len, loff_t pos,
if (error < 0)
return (error);
return (len - uio.uio_resid);
read = len - uio.uio_resid;
task_io_account_read(read);
return (read);
}
static ssize_t
@ -213,6 +217,7 @@ zpl_write_common(struct inode *ip, const char *buf, size_t len, loff_t pos,
uio_seg_t segment, int flags, cred_t *cr)
{
int error;
ssize_t wrote;
struct iovec iov;
uio_t uio;
@ -230,7 +235,10 @@ zpl_write_common(struct inode *ip, const char *buf, size_t len, loff_t pos,
if (error < 0)
return (error);
return (len - uio.uio_resid);
wrote = len - uio.uio_resid;
task_io_account_write(wrote);
return (wrote);
}
static ssize_t