workqueue: skip the node_nr_active update for non-unbound workqueuesgrafted

apply_wqattrs_commit() updates node_nr_active->max unconditionally.
wq->node_nr_active[] is only allocated for unbound workqueues, so guard
the call before per-cpu workqueues start using this path.

No functional change: only unbound workqueues reach apply_wqattrs_*()
today.

Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 103 insertions, 0 deletions

diff --git a/fs/netfs/fscache_stats.c b/fs/netfs/fscache_stats.c
new file mode 100644
index 000000000..add21abdf
--- /dev/null
+++ b/fs/netfs/fscache_stats.c
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* FS-Cache statistics
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL CACHE
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include "internal.h"
+
+/*
+ * operation counters
+ */
+atomic_t fscache_n_volumes;
+atomic_t fscache_n_volumes_collision;
+atomic_t fscache_n_volumes_nomem;
+atomic_t fscache_n_cookies;
+atomic_t fscache_n_cookies_lru;
+atomic_t fscache_n_cookies_lru_expired;
+atomic_t fscache_n_cookies_lru_removed;
+atomic_t fscache_n_cookies_lru_dropped;
+
+atomic_t fscache_n_acquires;
+atomic_t fscache_n_acquires_ok;
+atomic_t fscache_n_acquires_oom;
+
+atomic_t fscache_n_invalidates;
+
+atomic_t fscache_n_updates;
+EXPORT_SYMBOL(fscache_n_updates);
+
+atomic_t fscache_n_relinquishes;
+atomic_t fscache_n_relinquishes_retire;
+atomic_t fscache_n_relinquishes_dropped;
+
+atomic_t fscache_n_resizes;
+atomic_t fscache_n_resizes_null;
+
+atomic_t fscache_n_read;
+EXPORT_SYMBOL(fscache_n_read);
+atomic_t fscache_n_write;
+EXPORT_SYMBOL(fscache_n_write);
+atomic_t fscache_n_no_write_space;
+EXPORT_SYMBOL(fscache_n_no_write_space);
+atomic_t fscache_n_no_create_space;
+EXPORT_SYMBOL(fscache_n_no_create_space);
+atomic_t fscache_n_culled;
+EXPORT_SYMBOL(fscache_n_culled);
+atomic_t fscache_n_dio_misfit;
+EXPORT_SYMBOL(fscache_n_dio_misfit);
+
+/*
+ * display the general statistics
+ */
+int fscache_stats_show(struct seq_file *m)
+{
+	seq_puts(m, "-- FS-Cache statistics --\n");
+	seq_printf(m, "Cookies: n=%d v=%d vcol=%u voom=%u\n",
+		   atomic_read(&fscache_n_cookies),
+		   atomic_read(&fscache_n_volumes),
+		   atomic_read(&fscache_n_volumes_collision),
+		   atomic_read(&fscache_n_volumes_nomem)
+		   );
+
+	seq_printf(m, "Acquire: n=%u ok=%u oom=%u\n",
+		   atomic_read(&fscache_n_acquires),
+		   atomic_read(&fscache_n_acquires_ok),
+		   atomic_read(&fscache_n_acquires_oom));
+
+	seq_printf(m, "LRU    : n=%u exp=%u rmv=%u drp=%u at=%ld\n",
+		   atomic_read(&fscache_n_cookies_lru),
+		   atomic_read(&fscache_n_cookies_lru_expired),
+		   atomic_read(&fscache_n_cookies_lru_removed),
+		   atomic_read(&fscache_n_cookies_lru_dropped),
+		   timer_pending(&fscache_cookie_lru_timer) ?
+		   fscache_cookie_lru_timer.expires - jiffies : 0);
+
+	seq_printf(m, "Invals : n=%u\n",
+		   atomic_read(&fscache_n_invalidates));
+
+	seq_printf(m, "Updates: n=%u rsz=%u rsn=%u\n",
+		   atomic_read(&fscache_n_updates),
+		   atomic_read(&fscache_n_resizes),
+		   atomic_read(&fscache_n_resizes_null));
+
+	seq_printf(m, "Relinqs: n=%u rtr=%u drop=%u\n",
+		   atomic_read(&fscache_n_relinquishes),
+		   atomic_read(&fscache_n_relinquishes_retire),
+		   atomic_read(&fscache_n_relinquishes_dropped));
+
+	seq_printf(m, "NoSpace: nwr=%u ncr=%u cull=%u\n",
+		   atomic_read(&fscache_n_no_write_space),
+		   atomic_read(&fscache_n_no_create_space),
+		   atomic_read(&fscache_n_culled));
+
+	seq_printf(m, "IO     : rd=%u wr=%u mis=%u\n",
+		   atomic_read(&fscache_n_read),
+		   atomic_read(&fscache_n_write),
+		   atomic_read(&fscache_n_dio_misfit));
+	return 0;
+}