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-rw-r--r--mm/page-writeback.c62
1 files changed, 38 insertions, 24 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 7326b54ab728..718565266257 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -387,8 +387,7 @@ static unsigned long global_dirtyable_memory(void)
* Calculate @dtc->thresh and ->bg_thresh considering
* vm_dirty_{bytes|ratio} and dirty_background_{bytes|ratio}. The caller
* must ensure that @dtc->avail is set before calling this function. The
- * dirty limits will be lifted by 1/4 for PF_LESS_THROTTLE (ie. nfsd) and
- * real-time tasks.
+ * dirty limits will be lifted by 1/4 for real-time tasks.
*/
static void domain_dirty_limits(struct dirty_throttle_control *dtc)
{
@@ -436,7 +435,7 @@ static void domain_dirty_limits(struct dirty_throttle_control *dtc)
if (bg_thresh >= thresh)
bg_thresh = thresh / 2;
tsk = current;
- if (tsk->flags & PF_LESS_THROTTLE || rt_task(tsk)) {
+ if (rt_task(tsk)) {
bg_thresh += bg_thresh / 4 + global_wb_domain.dirty_limit / 32;
thresh += thresh / 4 + global_wb_domain.dirty_limit / 32;
}
@@ -486,7 +485,7 @@ static unsigned long node_dirty_limit(struct pglist_data *pgdat)
else
dirty = vm_dirty_ratio * node_memory / 100;
- if (tsk->flags & PF_LESS_THROTTLE || rt_task(tsk))
+ if (rt_task(tsk))
dirty += dirty / 4;
return dirty;
@@ -505,7 +504,6 @@ bool node_dirty_ok(struct pglist_data *pgdat)
unsigned long nr_pages = 0;
nr_pages += node_page_state(pgdat, NR_FILE_DIRTY);
- nr_pages += node_page_state(pgdat, NR_UNSTABLE_NFS);
nr_pages += node_page_state(pgdat, NR_WRITEBACK);
return nr_pages <= limit;
@@ -759,7 +757,7 @@ static void mdtc_calc_avail(struct dirty_throttle_control *mdtc,
* bounded by the bdi->min_ratio and/or bdi->max_ratio parameters, if set.
*
* Return: @wb's dirty limit in pages. The term "dirty" in the context of
- * dirty balancing includes all PG_dirty, PG_writeback and NFS unstable pages.
+ * dirty balancing includes all PG_dirty and PG_writeback pages.
*/
static unsigned long __wb_calc_thresh(struct dirty_throttle_control *dtc)
{
@@ -1567,7 +1565,7 @@ static void balance_dirty_pages(struct bdi_writeback *wb,
struct dirty_throttle_control * const mdtc = mdtc_valid(&mdtc_stor) ?
&mdtc_stor : NULL;
struct dirty_throttle_control *sdtc;
- unsigned long nr_reclaimable; /* = file_dirty + unstable_nfs */
+ unsigned long nr_reclaimable; /* = file_dirty */
long period;
long pause;
long max_pause;
@@ -1587,14 +1585,7 @@ static void balance_dirty_pages(struct bdi_writeback *wb,
unsigned long m_thresh = 0;
unsigned long m_bg_thresh = 0;
- /*
- * Unstable writes are a feature of certain networked
- * filesystems (i.e. NFS) in which data may have been
- * written to the server's write cache, but has not yet
- * been flushed to permanent storage.
- */
- nr_reclaimable = global_node_page_state(NR_FILE_DIRTY) +
- global_node_page_state(NR_UNSTABLE_NFS);
+ nr_reclaimable = global_node_page_state(NR_FILE_DIRTY);
gdtc->avail = global_dirtyable_memory();
gdtc->dirty = nr_reclaimable + global_node_page_state(NR_WRITEBACK);
@@ -1653,8 +1644,12 @@ static void balance_dirty_pages(struct bdi_writeback *wb,
if (dirty <= dirty_freerun_ceiling(thresh, bg_thresh) &&
(!mdtc ||
m_dirty <= dirty_freerun_ceiling(m_thresh, m_bg_thresh))) {
- unsigned long intv = dirty_poll_interval(dirty, thresh);
- unsigned long m_intv = ULONG_MAX;
+ unsigned long intv;
+ unsigned long m_intv;
+
+free_running:
+ intv = dirty_poll_interval(dirty, thresh);
+ m_intv = ULONG_MAX;
current->dirty_paused_when = now;
current->nr_dirtied = 0;
@@ -1673,9 +1668,20 @@ static void balance_dirty_pages(struct bdi_writeback *wb,
* Calculate global domain's pos_ratio and select the
* global dtc by default.
*/
- if (!strictlimit)
+ if (!strictlimit) {
wb_dirty_limits(gdtc);
+ if ((current->flags & PF_LOCAL_THROTTLE) &&
+ gdtc->wb_dirty <
+ dirty_freerun_ceiling(gdtc->wb_thresh,
+ gdtc->wb_bg_thresh))
+ /*
+ * LOCAL_THROTTLE tasks must not be throttled
+ * when below the per-wb freerun ceiling.
+ */
+ goto free_running;
+ }
+
dirty_exceeded = (gdtc->wb_dirty > gdtc->wb_thresh) &&
((gdtc->dirty > gdtc->thresh) || strictlimit);
@@ -1689,9 +1695,20 @@ static void balance_dirty_pages(struct bdi_writeback *wb,
* both global and memcg domains. Choose the one
* w/ lower pos_ratio.
*/
- if (!strictlimit)
+ if (!strictlimit) {
wb_dirty_limits(mdtc);
+ if ((current->flags & PF_LOCAL_THROTTLE) &&
+ mdtc->wb_dirty <
+ dirty_freerun_ceiling(mdtc->wb_thresh,
+ mdtc->wb_bg_thresh))
+ /*
+ * LOCAL_THROTTLE tasks must not be
+ * throttled when below the per-wb
+ * freerun ceiling.
+ */
+ goto free_running;
+ }
dirty_exceeded |= (mdtc->wb_dirty > mdtc->wb_thresh) &&
((mdtc->dirty > mdtc->thresh) || strictlimit);
@@ -1938,8 +1955,7 @@ bool wb_over_bg_thresh(struct bdi_writeback *wb)
* as we're trying to decide whether to put more under writeback.
*/
gdtc->avail = global_dirtyable_memory();
- gdtc->dirty = global_node_page_state(NR_FILE_DIRTY) +
- global_node_page_state(NR_UNSTABLE_NFS);
+ gdtc->dirty = global_node_page_state(NR_FILE_DIRTY);
domain_dirty_limits(gdtc);
if (gdtc->dirty > gdtc->bg_thresh)
@@ -2164,7 +2180,6 @@ int write_cache_pages(struct address_space *mapping,
int error;
struct pagevec pvec;
int nr_pages;
- pgoff_t uninitialized_var(writeback_index);
pgoff_t index;
pgoff_t end; /* Inclusive */
pgoff_t done_index;
@@ -2173,8 +2188,7 @@ int write_cache_pages(struct address_space *mapping,
pagevec_init(&pvec);
if (wbc->range_cyclic) {
- writeback_index = mapping->writeback_index; /* prev offset */
- index = writeback_index;
+ index = mapping->writeback_index; /* prev offset */
end = -1;
} else {
index = wbc->range_start >> PAGE_SHIFT;
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-23 11:04:17 +0300