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f1d3b8f91d
This patch adds initial support for dlm tracepoints. It will introduce tracepoints to dlm main functionality dlm_lock()/dlm_unlock() and their complete ast() callback or blocking bast() callback. The lock/unlock functionality has a start and end tracepoint, this is because there exists a race in case if would have a tracepoint at the end position only the complete/blocking callbacks could occur before. To work with eBPF tracing and using their lookup hash functionality there could be problems that an entry was not inserted yet. However use the start functionality for hash insert and check again in end functionality if there was an dlm internal error so there is no ast callback. In further it might also that locks with local masters will occur those callbacks immediately so we must have such functionality. I did not make everything accessible yet, although it seems eBPF can be used to access a lot of internal datastructures if it's aware of the struct definitions of the running kernel instance. We still can change it, if you do eBPF experiments e.g. time measurements between lock and callback functionality you can simple use the local lkb_id field as hash value in combination with the lockspace id if you have multiple lockspaces. Otherwise you can simple use trace-cmd for some functionality, e.g. `trace-cmd record -e dlm` and `trace-cmd report` afterwards. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
97 lines
1.9 KiB
C
97 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/******************************************************************************
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*******************************************************************************
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**
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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**
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**
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*******************************************************************************
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******************************************************************************/
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#include <linux/module.h>
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#include "dlm_internal.h"
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#include "lockspace.h"
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#include "lock.h"
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#include "user.h"
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#include "memory.h"
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#include "config.h"
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#include "lowcomms.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/dlm.h>
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static int __init init_dlm(void)
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{
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int error;
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error = dlm_memory_init();
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if (error)
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goto out;
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error = dlm_lockspace_init();
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if (error)
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goto out_mem;
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error = dlm_config_init();
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if (error)
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goto out_lockspace;
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dlm_register_debugfs();
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error = dlm_user_init();
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if (error)
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goto out_debug;
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error = dlm_netlink_init();
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if (error)
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goto out_user;
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error = dlm_plock_init();
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if (error)
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goto out_netlink;
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printk("DLM installed\n");
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return 0;
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out_netlink:
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dlm_netlink_exit();
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out_user:
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dlm_user_exit();
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out_debug:
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dlm_unregister_debugfs();
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dlm_config_exit();
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out_lockspace:
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dlm_lockspace_exit();
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out_mem:
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dlm_memory_exit();
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out:
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return error;
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}
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static void __exit exit_dlm(void)
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{
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dlm_plock_exit();
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dlm_netlink_exit();
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dlm_user_exit();
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dlm_config_exit();
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dlm_memory_exit();
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dlm_lockspace_exit();
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dlm_lowcomms_exit();
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dlm_unregister_debugfs();
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}
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module_init(init_dlm);
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module_exit(exit_dlm);
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MODULE_DESCRIPTION("Distributed Lock Manager");
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MODULE_AUTHOR("Red Hat, Inc.");
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MODULE_LICENSE("GPL");
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EXPORT_SYMBOL_GPL(dlm_new_lockspace);
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EXPORT_SYMBOL_GPL(dlm_release_lockspace);
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EXPORT_SYMBOL_GPL(dlm_lock);
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EXPORT_SYMBOL_GPL(dlm_unlock);
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