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