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Provide a way to set gettimeofday() function for an infected task. CRIU's parasite & restorer are very voluble as more logs are better than lesser in terms of bug investigations. In all modern kernels there is a way to get time without entering kernel: vdso. So, add a way to reduce the cost of logging without making it less valuable. [I'm not particularly fond of std_log_set_gettimeofday() name, so if someone can come with a better naming - I'm up for a change] Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Andrei Vagin <avagin@gmail.com>
29 lines
1.2 KiB
C
29 lines
1.2 KiB
C
#ifndef COMPEL_PLUGIN_STD_LOG_H__
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#define COMPEL_PLUGIN_STD_LOG_H__
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#include "compel/loglevels.h"
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#define STD_LOG_SIMPLE_CHUNK 256
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extern void std_log_set_fd(int fd);
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extern void std_log_set_loglevel(enum __compel_log_levels level);
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extern void std_log_set_start(struct timeval *tv);
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/*
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* Provides a function to get time *in the infected task* for log timings.
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* Expected use-case: address on the vdso page to get time.
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* If not set or called with NULL - compel will use raw syscall,
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* which requires enter in the kernel and as a result affects performance.
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*/
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typedef int (*gettimeofday_t)(struct timeval *tv, struct timezone *tz);
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extern void std_log_set_gettimeofday(gettimeofday_t gtod);
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/* std plugin helper to get time (hopefully, efficiently) */
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extern int std_gettimeofday(struct timeval *tv, struct timezone *tz);
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extern int std_vprint_num(char *buf, int blen, int num, char **ps);
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extern void std_sprintf(char output[STD_LOG_SIMPLE_CHUNK], const char *format, ...)
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__attribute__ ((__format__ (__printf__, 2, 3)));
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extern void print_on_level(unsigned int loglevel, const char *format, ...)
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__attribute__ ((__format__ (__printf__, 2, 3)));
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#endif /* COMPEL_PLUGIN_STD_LOG_H__ */
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