Depends on: https://lkml.kernel.org/r/1457107853-8689-1-git-send-email-axboe@xxxxxx Use file open PID and inode's i_no to differentiate seed generation streamid when fadvise is not supplied. Effectivly attempting simulate the effect that stream id may have on certain predictable workloads. Signed-off-by: Shaun Tancheff <shaun.tancheff@xxxxxxxxxxx> --- drivers/md/dm-zoned.c | 12 +++++++++++- fs/ext4/file.c | 1 + fs/xfs/xfs_aops.c | 2 +- fs/xfs/xfs_file.c | 1 + include/linux/fs.h | 10 ++++++++-- 5 files changed, 22 insertions(+), 4 deletions(-) diff --git a/drivers/md/dm-zoned.c b/drivers/md/dm-zoned.c index 6cab33e..90da803 100644 --- a/drivers/md/dm-zoned.c +++ b/drivers/md/dm-zoned.c @@ -121,8 +121,18 @@ static inline u32 bio_stream(struct bio *bio) * use this heuristic to try to skip unnecessary co-mingling of data. */ - if (bio->bi_rw & REQ_META) + if (bio->bi_rw & REQ_META) { stream_id = 0xff; + } else { + unsigned int id = bio_get_streamid(bio); + + /* high 8 bits is hash of PID, low 8 bits is hash of inode# */ + stream_id = id >> 8; + if (stream_id == 0) + stream_id++; + if (stream_id == 0xff) + stream_id--; + } return stream_id; } diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 4cd318f..1c5102c 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -340,6 +340,7 @@ static int ext4_file_open(struct inode * inode, struct file * filp) char buf[64], *cp; int ret; + inode->pid = get_current()->pid; if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) && !(sb->s_flags & MS_RDONLY))) { sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED; diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 9a35e61..8f78de4 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -382,7 +382,7 @@ xfs_submit_ioend_bio( atomic_inc(&ioend->io_remaining); bio->bi_private = ioend; bio->bi_end_io = xfs_end_bio; - bio_set_streamid(bio, ioend->io_inode->i_streamid); + bio_set_streamid(bio, inode_streamid(ioend->io_inode)); submit_bio(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE, bio); } diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 52883ac..c38ea85 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1058,6 +1058,7 @@ xfs_file_open( return -EFBIG; if (XFS_FORCED_SHUTDOWN(XFS_M(inode->i_sb))) return -EIO; + inode->pid = get_current()->pid; return 0; } diff --git a/include/linux/fs.h b/include/linux/fs.h index 10599d2..5d45e66 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -32,6 +32,7 @@ #include <linux/workqueue.h> #include <linux/percpu-rwsem.h> #include <linux/delayed_call.h> +#include <linux/hash.h> #include <asm/byteorder.h> #include <uapi/linux/fs.h> @@ -678,15 +679,20 @@ struct inode { __u32 i_fsnotify_mask; /* all events this inode cares about */ struct hlist_head i_fsnotify_marks; #endif + pid_t pid; /* use PID for fallback streamid */ void *i_private; /* fs or device private pointer */ }; static inline unsigned int inode_streamid(struct inode *inode) { - if (inode) - return inode->i_streamid; + if (inode) { + if (inode->i_streamid) + return inode->i_streamid; + return ((hash_32(inode->pid, 8) << 8) + |hash_32(inode->i_ino, 8)); + } return 0; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
