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/*
* 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.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* lustre/lvfs/lvfs_lib.c
*
* Lustre filesystem abstraction routines
*
* Author: Andreas Dilger <adilger@clusterfs.com>
*/
#include <linux/module.h>
#include "../include/lustre_lib.h"
#include "../include/lprocfs_status.h"
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;
/* 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;
/* 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);
int lprocfs_stats_alloc_one(struct lprocfs_stats *stats, unsigned int cpuid)
{
struct lprocfs_counter *cntr;
unsigned int percpusize;
int rc = -ENOMEM;
unsigned long flags = 0;
int i;
LASSERT(stats->ls_percpu[cpuid] == NULL);
LASSERT((stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) == 0);
percpusize = lprocfs_stats_counter_size(stats);
LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[cpuid], percpusize);
if (stats->ls_percpu[cpuid] != NULL) {
rc = 0;
if (unlikely(stats->ls_biggest_alloc_num <= cpuid)) {
if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
spin_lock_irqsave(&stats->ls_lock, flags);
else
spin_lock(&stats->ls_lock);
if (stats->ls_biggest_alloc_num <= cpuid)
stats->ls_biggest_alloc_num = cpuid + 1;
if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
spin_unlock_irqrestore(&stats->ls_lock, flags);
else
spin_unlock(&stats->ls_lock);
}
/* initialize the ls_percpu[cpuid] non-zero counter */
for (i = 0; i < stats->ls_num; ++i) {
cntr = lprocfs_stats_counter_get(stats, cpuid, i);
cntr->lc_min = LC_MIN_INIT;
}
}
return rc;
}
EXPORT_SYMBOL(lprocfs_stats_alloc_one);
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