On Wed 22-11-17 16:15:57, Josef Bacik wrote:
> From: Josef Bacik <jbacik@xxxxxx>
>
> These are counters that constantly go up in order to do bandwidth calculations.
> It isn't important what the units are in, as long as they are consistent between
> the two of them, so convert them to count bytes written/dirtied, and allow the
> metadata accounting stuff to change the counters as well.
>
> Signed-off-by: Josef Bacik <jbacik@xxxxxx>
> Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Looks good to me. You can add:
Reviewed-by: Jan Kara <jack@xxxxxxx>
Honza
> ---
> fs/fuse/file.c | 4 ++--
> include/linux/backing-dev-defs.h | 4 ++--
> include/linux/backing-dev.h | 2 +-
> mm/backing-dev.c | 9 +++++----
> mm/page-writeback.c | 20 ++++++++++----------
> 5 files changed, 20 insertions(+), 19 deletions(-)
>
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index cb7dff5c45d7..67e7c4fac28d 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -1471,7 +1471,7 @@ static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req)
> for (i = 0; i < req->num_pages; i++) {
> dec_wb_stat(&bdi->wb, WB_WRITEBACK);
> dec_node_page_state(req->pages[i], NR_WRITEBACK_TEMP);
> - wb_writeout_inc(&bdi->wb);
> + wb_writeout_add(&bdi->wb, PAGE_SIZE);
> }
> wake_up(&fi->page_waitq);
> }
> @@ -1776,7 +1776,7 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
>
> dec_wb_stat(&bdi->wb, WB_WRITEBACK);
> dec_node_page_state(page, NR_WRITEBACK_TEMP);
> - wb_writeout_inc(&bdi->wb);
> + wb_writeout_add(&bdi->wb, PAGE_SIZE);
> fuse_writepage_free(fc, new_req);
> fuse_request_free(new_req);
> goto out;
> diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
> index 866c433e7d32..ded45ac2cec7 100644
> --- a/include/linux/backing-dev-defs.h
> +++ b/include/linux/backing-dev-defs.h
> @@ -36,8 +36,8 @@ typedef int (congested_fn)(void *, int);
> enum wb_stat_item {
> WB_RECLAIMABLE,
> WB_WRITEBACK,
> - WB_DIRTIED,
> - WB_WRITTEN,
> + WB_DIRTIED_BYTES,
> + WB_WRITTEN_BYTES,
> NR_WB_STAT_ITEMS
> };
>
> diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
> index 14e266d12620..39b8dc486ea7 100644
> --- a/include/linux/backing-dev.h
> +++ b/include/linux/backing-dev.h
> @@ -89,7 +89,7 @@ static inline s64 wb_stat_sum(struct bdi_writeback *wb, enum wb_stat_item item)
> return percpu_counter_sum_positive(&wb->stat[item]);
> }
>
> -extern void wb_writeout_inc(struct bdi_writeback *wb);
> +extern void wb_writeout_add(struct bdi_writeback *wb, long bytes);
>
> /*
> * maximal error of a stat counter.
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index e19606bb41a0..62a332a91b38 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -68,14 +68,15 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
> wb_thresh = wb_calc_thresh(wb, dirty_thresh);
>
> #define K(x) ((x) << (PAGE_SHIFT - 10))
> +#define BtoK(x) ((x) >> 10)
> seq_printf(m,
> "BdiWriteback: %10lu kB\n"
> "BdiReclaimable: %10lu kB\n"
> "BdiDirtyThresh: %10lu kB\n"
> "DirtyThresh: %10lu kB\n"
> "BackgroundThresh: %10lu kB\n"
> - "BdiDirtied: %10lu kB\n"
> - "BdiWritten: %10lu kB\n"
> + "BdiDirtiedBytes: %10lu kB\n"
> + "BdiWrittenBytes: %10lu kB\n"
> "BdiWriteBandwidth: %10lu kBps\n"
> "b_dirty: %10lu\n"
> "b_io: %10lu\n"
> @@ -88,8 +89,8 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
> K(wb_thresh),
> K(dirty_thresh),
> K(background_thresh),
> - (unsigned long) K(wb_stat(wb, WB_DIRTIED)),
> - (unsigned long) K(wb_stat(wb, WB_WRITTEN)),
> + (unsigned long) BtoK(wb_stat(wb, WB_DIRTIED_BYTES)),
> + (unsigned long) BtoK(wb_stat(wb, WB_WRITTEN_BYTES)),
> (unsigned long) K(wb->write_bandwidth),
> nr_dirty,
> nr_io,
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index 1a47d4296750..e4563645749a 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -597,11 +597,11 @@ static void wb_domain_writeout_inc(struct wb_domain *dom,
> * Increment @wb's writeout completion count and the global writeout
> * completion count. Called from test_clear_page_writeback().
> */
> -static inline void __wb_writeout_inc(struct bdi_writeback *wb)
> +static inline void __wb_writeout_add(struct bdi_writeback *wb, long bytes)
> {
> struct wb_domain *cgdom;
>
> - inc_wb_stat(wb, WB_WRITTEN);
> + __add_wb_stat(wb, WB_WRITTEN_BYTES, bytes);
> wb_domain_writeout_inc(&global_wb_domain, &wb->completions,
> wb->bdi->max_prop_frac);
>
> @@ -611,15 +611,15 @@ static inline void __wb_writeout_inc(struct bdi_writeback *wb)
> wb->bdi->max_prop_frac);
> }
>
> -void wb_writeout_inc(struct bdi_writeback *wb)
> +void wb_writeout_add(struct bdi_writeback *wb, long bytes)
> {
> unsigned long flags;
>
> local_irq_save(flags);
> - __wb_writeout_inc(wb);
> + __wb_writeout_add(wb, bytes);
> local_irq_restore(flags);
> }
> -EXPORT_SYMBOL_GPL(wb_writeout_inc);
> +EXPORT_SYMBOL_GPL(wb_writeout_add);
>
> /*
> * On idle system, we can be called long after we scheduled because we use
> @@ -1362,8 +1362,8 @@ static void __wb_update_bandwidth(struct dirty_throttle_control *gdtc,
> if (elapsed < BANDWIDTH_INTERVAL)
> return;
>
> - dirtied = percpu_counter_read(&wb->stat[WB_DIRTIED]);
> - written = percpu_counter_read(&wb->stat[WB_WRITTEN]);
> + dirtied = percpu_counter_read(&wb->stat[WB_DIRTIED_BYTES]) >> PAGE_SHIFT;
> + written = percpu_counter_read(&wb->stat[WB_WRITTEN_BYTES]) >> PAGE_SHIFT;
>
> /*
> * Skip quiet periods when disk bandwidth is under-utilized.
> @@ -2435,7 +2435,7 @@ void account_page_dirtied(struct page *page, struct address_space *mapping)
> __inc_zone_page_state(page, NR_ZONE_WRITE_PENDING);
> __inc_node_page_state(page, NR_DIRTIED);
> inc_wb_stat(wb, WB_RECLAIMABLE);
> - inc_wb_stat(wb, WB_DIRTIED);
> + __add_wb_stat(wb, WB_DIRTIED_BYTES, PAGE_SIZE);
> task_io_account_write(PAGE_SIZE);
> current->nr_dirtied++;
> this_cpu_inc(bdp_ratelimits);
> @@ -2522,7 +2522,7 @@ void account_page_redirty(struct page *page)
> wb = unlocked_inode_to_wb_begin(inode, &locked);
> current->nr_dirtied--;
> dec_node_page_state(page, NR_DIRTIED);
> - dec_wb_stat(wb, WB_DIRTIED);
> + __add_wb_stat(wb, WB_DIRTIED_BYTES, -(long)PAGE_SIZE);
> unlocked_inode_to_wb_end(inode, locked);
> }
> }
> @@ -2744,7 +2744,7 @@ int test_clear_page_writeback(struct page *page)
> struct bdi_writeback *wb = inode_to_wb(inode);
>
> dec_wb_stat(wb, WB_WRITEBACK);
> - __wb_writeout_inc(wb);
> + __wb_writeout_add(wb, PAGE_SIZE);
> }
> }
>
> --
> 2.7.5
>
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
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