mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-09 02:51:11 +01:00
Steven Rostedt (Red Hat)
374855c5e4
Add the functions kbuffer_subbuf_timestamp() and kbuffer_ptr_delta() to get the timing data stored in the ring buffer that is used to produced the time stamps of the records. This is useful for tools like trace-cmd to be able to display the content of the read data to understand why the records show the time stamps that they do. Link: http://lore.kernel.org/linux-trace-devel/[email protected] Signed-off-by: Steven Rostedt (VMware) <[email protected]> [ Ported from trace-cmd.git ] Cc: Andrew Morton <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: [email protected] Link: http://lore.kernel.org/lkml/[email protected] Signed-off-by: Tzvetomir Stoyanov (VMware) <[email protected]> Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*
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* Copyright (C) 2012 Red Hat Inc, Steven Rostedt <[email protected]>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License (not later!)
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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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#ifndef _KBUFFER_H
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#define _KBUFFER_H
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#ifndef TS_SHIFT
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#define TS_SHIFT 27
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#endif
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enum kbuffer_endian {
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KBUFFER_ENDIAN_BIG,
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KBUFFER_ENDIAN_LITTLE,
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};
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enum kbuffer_long_size {
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KBUFFER_LSIZE_4,
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KBUFFER_LSIZE_8,
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};
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enum {
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KBUFFER_TYPE_PADDING = 29,
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KBUFFER_TYPE_TIME_EXTEND = 30,
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KBUFFER_TYPE_TIME_STAMP = 31,
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};
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struct kbuffer;
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struct kbuffer *kbuffer_alloc(enum kbuffer_long_size size, enum kbuffer_endian endian);
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void kbuffer_free(struct kbuffer *kbuf);
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int kbuffer_load_subbuffer(struct kbuffer *kbuf, void *subbuffer);
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void *kbuffer_read_event(struct kbuffer *kbuf, unsigned long long *ts);
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void *kbuffer_next_event(struct kbuffer *kbuf, unsigned long long *ts);
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unsigned long long kbuffer_timestamp(struct kbuffer *kbuf);
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unsigned long long kbuffer_subbuf_timestamp(struct kbuffer *kbuf, void *subbuf);
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unsigned int kbuffer_ptr_delta(struct kbuffer *kbuf, void *ptr);
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void *kbuffer_translate_data(int swap, void *data, unsigned int *size);
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void *kbuffer_read_at_offset(struct kbuffer *kbuf, int offset, unsigned long long *ts);
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int kbuffer_curr_index(struct kbuffer *kbuf);
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int kbuffer_curr_offset(struct kbuffer *kbuf);
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int kbuffer_curr_size(struct kbuffer *kbuf);
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int kbuffer_event_size(struct kbuffer *kbuf);
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int kbuffer_missed_events(struct kbuffer *kbuf);
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int kbuffer_subbuffer_size(struct kbuffer *kbuf);
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void kbuffer_set_old_format(struct kbuffer *kbuf);
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int kbuffer_start_of_data(struct kbuffer *kbuf);
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/* Debugging */
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struct kbuffer_raw_info {
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int type;
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int length;
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unsigned long long delta;
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void *next;
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};
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/* Read raw data */
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struct kbuffer_raw_info *kbuffer_raw_get(struct kbuffer *kbuf, void *subbuf,
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struct kbuffer_raw_info *info);
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#endif /* _K_BUFFER_H */
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