mirror of
https://github.com/clearlinux/kvmtool.git
synced 2026-08-29 12:43:56 +00:00
Prasad Joshi
aa400b0039
Add a command line debug option to add a fix amount of delay in read and write operation. From Ingo "the delays are *constant* [make sure you use a high-res timers kernel], so they do not result in nearly as much measurement noise as real block IO does. [...] This way you are basically 'emulating' a real disk drive but you will emulate uniform latencies, which makes measurements a lot more reliable - while still relevant to the end result." Suggested-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Prasad Joshi <prasadjoshi124@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
79 lines
2.0 KiB
C
79 lines
2.0 KiB
C
#include <linux/stringify.h>
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#ifndef KVM__UTIL_H
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#define KVM__UTIL_H
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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/*
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* Some bits are stolen from perf tool :)
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <limits.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#ifdef __GNUC__
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#define NORETURN __attribute__((__noreturn__))
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#else
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#define NORETURN
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#ifndef __attribute__
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#define __attribute__(x)
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#endif
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#endif
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extern bool do_debug_print;
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#define PROT_RW (PROT_READ|PROT_WRITE)
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#define MAP_ANON_NORESERVE (MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE)
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extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
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extern void die_perror(const char *s) NORETURN;
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extern int pr_error(const char *err, ...) __attribute__((format (printf, 1, 2)));
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extern void pr_warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
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extern void pr_info(const char *err, ...) __attribute__((format (printf, 1, 2)));
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extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
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#define pr_debug(fmt, ...) \
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do { \
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if (do_debug_print) \
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pr_info("(%s) %s:%d: " fmt, __FILE__, \
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__func__, __LINE__, ##__VA_ARGS__); \
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} while (0)
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#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
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#define DIE_IF(cnd) \
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do { \
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if (cnd) \
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die(" at (" __FILE__ ":" __stringify(__LINE__) "): " \
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__stringify(cnd) "\n"); \
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} while (0)
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extern size_t strlcat(char *dest, const char *src, size_t count);
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/* some inline functions */
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static inline const char *skip_prefix(const char *str, const char *prefix)
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{
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size_t len = strlen(prefix);
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return strncmp(str, prefix, len) ? NULL : str + len;
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}
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#define MSECS_TO_USECS(s) ((s) * 1000)
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/* Millisecond sleep */
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static inline void msleep(unsigned int msecs)
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{
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usleep(MSECS_TO_USECS(msecs));
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}
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#endif /* KVM__UTIL_H */
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