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authorTejun Heo <tj@kernel.org>2015-05-22 18:23:32 -0400
committerJens Axboe <axboe@fb.com>2015-06-02 08:38:13 -0600
commit947e9762a8ddefda38aa21e249e6a4fec215cd12 (patch)
tree6ac8e8f9636ec937e720449753c88874bbd41620 /mm/page-writeback.c
parentaa661bbe1e61ce80ca4ae98804f673ede94b0827 (diff)
writeback: update wb_over_bg_thresh() to use wb_domain aware operations
wb_over_bg_thresh() currently uses global_dirty_limits() and wb_dirty_limit() both of which are wrappers around operations which take dirty_throttle_control. For cgroup writeback support, the function will be updated to also consider memcg wb_domains which requires the context information carried in dirty_throttle_control. This patch updates wb_over_bg_thresh() so that it uses the underlying wb_domain aware operations directly and builds the global dirty_throttle_control in the process. This patch doesn't introduce any behavioral changes. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Jan Kara <jack@suse.cz> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Greg Thelen <gthelen@google.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'mm/page-writeback.c')
-rw-r--r--mm/page-writeback.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 9d9a896fa7b5..a7ba5cee950b 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1749,15 +1749,22 @@ EXPORT_SYMBOL(balance_dirty_pages_ratelimited);
*/
bool wb_over_bg_thresh(struct bdi_writeback *wb)
{
- unsigned long background_thresh, dirty_thresh;
+ struct dirty_throttle_control gdtc_stor = { GDTC_INIT(wb) };
+ struct dirty_throttle_control * const gdtc = &gdtc_stor;
- global_dirty_limits(&background_thresh, &dirty_thresh);
+ /*
+ * Similar to balance_dirty_pages() but ignores pages being written
+ * as we're trying to decide whether to put more under writeback.
+ */
+ gdtc->avail = global_dirtyable_memory();
+ gdtc->dirty = global_page_state(NR_FILE_DIRTY) +
+ global_page_state(NR_UNSTABLE_NFS);
+ domain_dirty_limits(gdtc);
- if (global_page_state(NR_FILE_DIRTY) +
- global_page_state(NR_UNSTABLE_NFS) > background_thresh)
+ if (gdtc->dirty > gdtc->bg_thresh)
return true;
- if (wb_stat(wb, WB_RECLAIMABLE) > wb_calc_thresh(wb, background_thresh))
+ if (wb_stat(wb, WB_RECLAIMABLE) > __wb_calc_thresh(gdtc))
return true;
return false;