48e5e4792d
Kernel changes: Inform hwpmc of executable objects brought into the system by kldload() and mmap(), and of their removal by kldunload() and munmap(). A helper function linker_hwpmc_list_objects() has been added to "sys/kern/kern_linker.c" and is used by hwpmc to retrieve the list of currently loaded kernel modules. The unused `MAPPINGCHANGE' event has been deprecated in favour of separate `MAP_IN' and `MAP_OUT' events; this change reduces space wastage in the log. Bump the hwpmc's ABI version to "2.0.00". Teach hwpmc(4) to handle the map change callbacks. Change the default per-cpu sample buffer size to hold 32 samples (up from 16). Increment __FreeBSD_version. libpmc(3) changes: Update libpmc(3) to deal with the new events in the log file; bring the pmclog(3) manual page in sync with the code. pmcstat(8) changes: Introduce new options to pmcstat(8): "-r" (root fs path), "-M" (mapfile name), "-q"/"-v" (verbosity control). Option "-k" now takes a kernel directory as its argument but will also work with the older invocation syntax. Rework string handling in pmcstat(8) to use an opaque type for interned strings. Clean up ELF parsing code and add support for tracking dynamic object mappings reported by a v2.0.00 hwpmc(4). Report statistics at the end of a log conversion run depending on the requested verbosity level. Reviewed by: jhb, dds (kernel parts of an earlier patch) Tested by: gallatin (earlier patch)
127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
/*-
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* Copyright (c) 2003-2006, Joseph Koshy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* PMC interface used by the base kernel.
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*/
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#ifndef _SYS_PMCKERN_H_
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#define _SYS_PMCKERN_H_
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/proc.h>
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#include <sys/sx.h>
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#define PMC_FN_PROCESS_EXEC 1
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#define PMC_FN_CSW_IN 2
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#define PMC_FN_CSW_OUT 3
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#define PMC_FN_DO_SAMPLES 4
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#define PMC_FN_KLD_LOAD 5
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#define PMC_FN_KLD_UNLOAD 6
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#define PMC_FN_MMAP 7
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#define PMC_FN_MUNMAP 8
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struct pmckern_procexec {
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int pm_credentialschanged;
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uintfptr_t pm_entryaddr;
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};
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struct pmckern_map_in {
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void *pm_file; /* filename or vnode pointer */
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uintfptr_t pm_address; /* address object is loaded at */
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};
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struct pmckern_map_out {
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uintfptr_t pm_address; /* start address of region */
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size_t pm_size; /* size of unmapped region */
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};
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/* hook */
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extern int (*pmc_hook)(struct thread *_td, int _function, void *_arg);
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extern int (*pmc_intr)(int _cpu, uintptr_t _pc, int _usermode);
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/* SX lock protecting the hook */
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extern struct sx pmc_sx;
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/* Per-cpu flags indicating availability of sampling data */
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extern volatile cpumask_t pmc_cpumask;
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/* Count of system-wide sampling PMCs in existence */
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extern volatile int pmc_ss_count;
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/* kernel version number */
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extern const int pmc_kernel_version;
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/* Hook invocation; for use within the kernel */
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#define PMC_CALL_HOOK(t, cmd, arg) \
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do { \
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sx_slock(&pmc_sx); \
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if (pmc_hook != NULL) \
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(pmc_hook)((t), (cmd), (arg)); \
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sx_sunlock(&pmc_sx); \
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} while (0)
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/* Hook invocation that needs an exclusive lock */
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#define PMC_CALL_HOOK_X(t, cmd, arg) \
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do { \
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sx_xlock(&pmc_sx); \
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if (pmc_hook != NULL) \
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(pmc_hook)((t), (cmd), (arg)); \
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sx_xunlock(&pmc_sx); \
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} while (0)
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/*
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* Some hook invocations (e.g., from context switch and clock handling
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* code) need to be lock-free.
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*/
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#define PMC_CALL_HOOK_UNLOCKED(t, cmd, arg) \
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do { \
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if (pmc_hook != NULL) \
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(pmc_hook)((t), (cmd), (arg)); \
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} while (0)
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#define PMC_SWITCH_CONTEXT(t,cmd) PMC_CALL_HOOK_UNLOCKED(t,cmd,NULL)
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/* Check if a process is using HWPMCs.*/
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#define PMC_PROC_IS_USING_PMCS(p) \
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(__predict_false(atomic_load_acq_int(&(p)->p_flag) & \
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P_HWPMC))
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#define PMC_SYSTEM_SAMPLING_ACTIVE() (pmc_ss_count > 0)
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/* Check if a CPU has recorded samples. */
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#define PMC_CPU_HAS_SAMPLES(C) (__predict_false(pmc_cpumask & (1 << (C))))
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/* helper functions */
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int pmc_cpu_is_disabled(int _cpu);
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int pmc_cpu_is_logical(int _cpu);
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#endif /* _SYS_PMCKERN_H_ */
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