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Bobi Jam authoredb=12211 i=green, adilger Description: make lustre randomly fail allocating memory Details : Make lustre randomly failed allocating memory for testing purpose.
Bobi Jam authoredb=12211 i=green, adilger Description: make lustre randomly fail allocating memory Details : Make lustre randomly failed allocating memory for testing purpose.
linux-sysctl.c 10.32 KiB
/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
* Copyright (C) 2001, 2002 Cluster File Systems, Inc.
*
* This file is part of the Lustre file system, http://www.lustre.org
* Lustre is a trademark of Cluster File Systems, Inc.
*
* You may have signed or agreed to another license before downloading
* this software. If so, you are bound by the terms and conditions
* of that agreement, and the following does not apply to you. See the
* LICENSE file included with this distribution for more information.
*
* If you did not agree to a different license, then this copy of Lustre
* is open source software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In either case, Lustre 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
* license text for more details.
*
*/
#include <linux/module.h>
#include <linux/autoconf.h>
#include <linux/sysctl.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/sysctl.h>
#include <linux/version.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/ctype.h>
#include <asm/bitops.h>
#include <asm/segment.h>
#include <asm/uaccess.h>
#include <linux/utsname.h>
#define DEBUG_SUBSYSTEM S_CLASS
#include <obd_support.h>
#include <lprocfs_status.h>
cfs_sysctl_table_header_t *obd_table_header = NULL;
#define OBD_SYSCTL 300
enum {
OBD_FAIL_LOC = 1, /* control test failures instrumentation */
OBD_FAIL_VAL, /* userdata for fail loc */
OBD_TIMEOUT, /* RPC timeout before recovery/intr */
OBD_DUMP_ON_TIMEOUT, /* dump kernel debug log upon eviction */
OBD_MEMUSED, /* bytes currently OBD_ALLOCated */
OBD_PAGESUSED, /* pages currently OBD_PAGE_ALLOCated */
OBD_MAXMEMUSED, /* maximum bytes OBD_ALLOCated concurrently */
OBD_MAXPAGESUSED, /* maximum pages OBD_PAGE_ALLOCated concurrently */
OBD_SYNCFILTER, /* XXX temporary, as we play with sync osts.. */
OBD_LDLM_TIMEOUT, /* LDLM timeout for ASTs before client eviction */
OBD_DUMP_ON_EVICTION, /* dump kernel debug log upon eviction */
OBD_DEBUG_PEER_ON_TIMEOUT, /* dump peer debug when RPC times out */
OBD_ALLOC_FAIL_RATE, /* memory allocation random failure rate */
};
int LL_PROC_PROTO(proc_fail_loc)
{
int rc;
int old_fail_loc = obd_fail_loc;
rc = ll_proc_dointvec(table, write, filp, buffer, lenp, ppos);
if (old_fail_loc != obd_fail_loc)
wake_up(&obd_race_waitq);
return rc;
}
int LL_PROC_PROTO(proc_set_timeout)
{
int rc;
rc = ll_proc_dointvec(table, write, filp, buffer, lenp, ppos);
if (ldlm_timeout >= obd_timeout)
ldlm_timeout = max(obd_timeout / 3, 1U);
return rc;
}
int LL_PROC_PROTO(proc_memory_alloc)
{
char buf[22];
int len;
DECLARE_LL_PROC_PPOS_DECL;
if (!*lenp || (*ppos && !write)) {
*lenp = 0;
return 0;
}
if (write)
return -EINVAL;
len = snprintf(buf, sizeof(buf), LPU64"\n", obd_memory_sum());
if (len > *lenp)
len = *lenp;
buf[len] = '\0';
if (copy_to_user(buffer, buf, len))
return -EFAULT;
*lenp = len;
*ppos += *lenp;
return 0;
}
int LL_PROC_PROTO(proc_pages_alloc)
{
char buf[22];
int len;
DECLARE_LL_PROC_PPOS_DECL;
if (!*lenp || (*ppos && !write)) {
*lenp = 0;
return 0;
}
if (write)
return -EINVAL;
len = snprintf(buf, sizeof(buf), LPU64"\n", obd_pages_sum());
if (len > *lenp)
len = *lenp;
buf[len] = '\0';
if (copy_to_user(buffer, buf, len))
return -EFAULT;
*lenp = len;
*ppos += *lenp;
return 0;
}
int LL_PROC_PROTO(proc_mem_max)
{
char buf[22];
int len;
DECLARE_LL_PROC_PPOS_DECL;
if (!*lenp || (*ppos && !write)) {
*lenp = 0;
return 0;
}
if (write)
return -EINVAL;
len = snprintf(buf, sizeof(buf), LPU64"\n", obd_memory_max());
if (len > *lenp)
len = *lenp;
buf[len] = '\0';
if (copy_to_user(buffer, buf, len))
return -EFAULT;
*lenp = len;
*ppos += *lenp;
return 0;
}
int LL_PROC_PROTO(proc_pages_max)
{
char buf[22];
int len;
DECLARE_LL_PROC_PPOS_DECL;
if (!*lenp || (*ppos && !write)) {
*lenp = 0;
return 0;
}
if (write)
return -EINVAL;
len = snprintf(buf, sizeof(buf), LPU64"\n", obd_pages_max());
if (len > *lenp)
len = *lenp;
buf[len] = '\0';
if (copy_to_user(buffer, buf, len))
return -EFAULT;
*lenp = len;
*ppos += *lenp;
return 0;
}
#ifdef RANDOM_FAIL_ALLOC
int LL_PROC_PROTO(proc_alloc_fail_rate)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,8)
loff_t *ppos = &filp->f_pos;
#endif
int rc = 0;
if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
*lenp = 0;
return 0;
}
if (write) {
rc = lprocfs_write_frac_helper(buffer, *lenp,
(unsigned int*)table->data,
OBD_ALLOC_FAIL_MULT);
} else {
char buf[21];
int len;
len = lprocfs_read_frac_helper(buf, 21,
*(unsigned int*)table->data,
OBD_ALLOC_FAIL_MULT);
if (len > *lenp)
len = *lenp;
buf[len] = '\0';
if (copy_to_user(buffer, buf, len)) return -EFAULT;
*lenp = len;
}
*ppos += *lenp;
return rc;
}
#endif
static cfs_sysctl_table_t obd_table[] = {
{
.ctl_name = OBD_FAIL_LOC,
.procname = "fail_loc",
.data = &obd_fail_loc,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_fail_loc
},
{
.ctl_name = OBD_FAIL_VAL,
.procname = "fail_val",
.data = &obd_fail_val,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
},
{
.ctl_name = OBD_TIMEOUT,
.procname = "timeout",
.data = &obd_timeout,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_set_timeout
},
{
.ctl_name = OBD_DEBUG_PEER_ON_TIMEOUT,
.procname = "debug_peer_on_timeout",
.data = &obd_debug_peer_on_timeout,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
},
{
.ctl_name = OBD_DUMP_ON_TIMEOUT,
.procname = "dump_on_timeout",
.data = &obd_dump_on_timeout,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
},
{
.ctl_name = OBD_DUMP_ON_EVICTION,
.procname = "dump_on_eviction",
.data = &obd_dump_on_eviction,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
},
{
.ctl_name = OBD_MEMUSED,
.procname = "memused",
.data = NULL,
.maxlen = 0,
.mode = 0444,
.proc_handler = &proc_memory_alloc
},
{
.ctl_name = OBD_PAGESUSED,
.procname = "pagesused",
.data = NULL,
.maxlen = 0, .mode = 0444,
.proc_handler = &proc_pages_alloc
},
{
.ctl_name = OBD_MAXMEMUSED,
.procname = "memused_max",
.data = NULL,
.maxlen = 0,
.mode = 0444,
.proc_handler = &proc_mem_max
},
{
.ctl_name = OBD_MAXPAGESUSED,
.procname = "pagesused_max",
.data = NULL,
.maxlen = 0,
.mode = 0444,
.proc_handler = &proc_pages_max
},
{
.ctl_name = OBD_LDLM_TIMEOUT,
.procname = "ldlm_timeout",
.data = &ldlm_timeout,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_set_timeout
},
#ifdef RANDOM_FAIL_LOC
{
.ctl_name = OBD_ALLOC_FAIL_RATE,
.procname = "alloc_fail_rate",
.data = &obd_alloc_fail_rate,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_alloc_fail_rate
},
#endif
{ 0 }
};
static cfs_sysctl_table_t parent_table[] = {
{
.ctl_name = OBD_SYSCTL,
.procname = "lustre",
.data = NULL,
.maxlen = 0,
.mode = 0555,
.child = obd_table
},
{0}
};
void obd_sysctl_init (void)
{
#ifdef CONFIG_SYSCTL
if ( !obd_table_header )
obd_table_header = cfs_register_sysctl_table(parent_table, 0);
#endif
}
void obd_sysctl_clean (void)
{
#ifdef CONFIG_SYSCTL
if ( obd_table_header )
cfs_unregister_sysctl_table(obd_table_header);
obd_table_header = NULL;
#endif
}