Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / staging / lustre / lustre / obdclass / lprocfs_counters.c

diff --git a/kernel/drivers/staging/lustre/lustre/obdclass/lprocfs_counters.c b/kernel/drivers/staging/lustre/lustre/obdclass/lprocfs_counters.c
new file mode 100644 (file)
index 0000000..c49dfe5
--- /dev/null
+++ b/kernel/drivers/staging/lustre/lustre/obdclass/lprocfs_counters.c
@@ -0,0 +1,139 @@
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ *
+ * http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, 2013, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/obdclass/lprocfs_counters.c
+ *
+ * Lustre lprocfs counter routines
+ *
+ * Author: Andreas Dilger <andreas.dilger@intel.com>
+ */
+
+#include <linux/module.h>
+#include "../include/lprocfs_status.h"
+#include "../include/obd_support.h"
+
+struct lprocfs_stats *obd_memory = NULL;
+EXPORT_SYMBOL(obd_memory);
+
+void lprocfs_counter_add(struct lprocfs_stats *stats, int idx, long amount)
+{
+       struct lprocfs_counter          *percpu_cntr;
+       struct lprocfs_counter_header   *header;
+       int                             smp_id;
+       unsigned long                   flags = 0;
+
+       if (stats == NULL)
+               return;
+
+       LASSERTF(0 <= idx && idx < stats->ls_num,
+                "idx %d, ls_num %hu\n", idx, stats->ls_num);
+
+       /* With per-client stats, statistics are allocated only for
+        * single CPU area, so the smp_id should be 0 always. */
+       smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
+       if (smp_id < 0)
+               return;
+
+       header = &stats->ls_cnt_header[idx];
+       percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
+       percpu_cntr->lc_count++;
+
+       if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
+               /*
+                * lprocfs_counter_add() can be called in interrupt context,
+                * as memory allocation could trigger memory shrinker call
+                * ldlm_pool_shrink(), which calls lprocfs_counter_add().
+                * LU-1727.
+                *
+                * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
+                * flag, because it needs accurate counting lest memory leak
+                * check reports error.
+                */
+               if (in_interrupt() &&
+                   (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
+                       percpu_cntr->lc_sum_irq += amount;
+               else
+                       percpu_cntr->lc_sum += amount;
+
+               if (header->lc_config & LPROCFS_CNTR_STDDEV)
+                       percpu_cntr->lc_sumsquare += (__s64)amount * amount;
+               if (amount < percpu_cntr->lc_min)
+                       percpu_cntr->lc_min = amount;
+               if (amount > percpu_cntr->lc_max)
+                       percpu_cntr->lc_max = amount;
+       }
+       lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
+}
+EXPORT_SYMBOL(lprocfs_counter_add);
+
+void lprocfs_counter_sub(struct lprocfs_stats *stats, int idx, long amount)
+{
+       struct lprocfs_counter          *percpu_cntr;
+       struct lprocfs_counter_header   *header;
+       int                             smp_id;
+       unsigned long                   flags = 0;
+
+       if (stats == NULL)
+               return;
+
+       LASSERTF(0 <= idx && idx < stats->ls_num,
+                "idx %d, ls_num %hu\n", idx, stats->ls_num);
+
+       /* With per-client stats, statistics are allocated only for
+        * single CPU area, so the smp_id should be 0 always. */
+       smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
+       if (smp_id < 0)
+               return;
+
+       header = &stats->ls_cnt_header[idx];
+       percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
+       if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
+               /*
+                * Sometimes we use RCU callbacks to free memory which calls
+                * lprocfs_counter_sub(), and RCU callbacks may execute in
+                * softirq context - right now that's the only case we're in
+                * softirq context here, use separate counter for that.
+                * bz20650.
+                *
+                * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
+                * flag, because it needs accurate counting lest memory leak
+                * check reports error.
+                */
+               if (in_interrupt() &&
+                   (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
+                       percpu_cntr->lc_sum_irq -= amount;
+               else
+                       percpu_cntr->lc_sum -= amount;
+       }
+       lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
+}
+EXPORT_SYMBOL(lprocfs_counter_sub);