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4dd37d092c
2006-10-22 Soren Sandmann <sandmann@daimi.au.dk> Communicate traces to userspace through shared memory instead of copying. * module/sysprof-module.c: Store the traces in a SysprofMmapArea. (sysprof_mmap): Implement this method. (sysprof_nopage): Implement this. (sysprof_read): Just reset the tail pointer and return zero. * module/sysprof-module.h (struct SysprofMmapArea): New structure. * collector.c (collector_stop): Unmap the device (in_dead_period): New function (on_read): Read the traces out of mmap()ed area instead of reading them. Call read() to prevent poll() from firing. (struct Collector): New members map_area and current. * Makefile.am (insert-module): Prefix modprobe with /sbin * collector.c (open_fd): mmap() the sysprof device.
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/* Sysprof -- Sampling, systemwide CPU profiler
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* Copyright 2004, Red Hat, Inc.
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* Copyright 2004, 2005, Soeren Sandmann
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef SYSPROF_MODULE_H
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#define SYSPROF_MODULE_H
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typedef struct SysprofStackTrace SysprofStackTrace;
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typedef struct SysprofStackInfo SysprofStackInfo;
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typedef struct SysprofMmapArea SysprofMmapArea;
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#define SYSPROF_N_TRACES 256
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#define SYSPROF_MAX_ADDRESSES 512
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struct SysprofStackTrace
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{
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int pid; /* -1 if in kernel */
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int truncated;
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int n_addresses; /* note: this can be 1 if the process was compiled
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* with -fomit-frame-pointer or is otherwise weird
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*/
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void *addresses[SYSPROF_MAX_ADDRESSES];
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};
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struct SysprofMmapArea
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{
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unsigned int head;
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SysprofStackTrace traces[SYSPROF_N_TRACES];
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};
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#endif
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