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logger: ensure that fsync is called at least every second

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In case a log ends abruptly, we will know that we have everything up to the
last second.

A test showed that CPU load and the amount of logging drops are unaffected
by this.
This commit is contained in:
Beat Küng 2018-05-03 11:39:39 +02:00 committed by Lorenz Meier
parent dd30012b27
commit bda237b368
1 changed files with 8 additions and 1 deletions
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9
src/modules/logger/log_writer_file.cpp
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@ -42,6 +42,9 @@
#include <systemlib/hardfault_log.h>
#endif /* __PX4_NUTTX */
using namespace time_literals;
namespace px4
{
namespace logger
@ -229,6 +232,7 @@ void LogWriterFile::run()
int poll_count = 0;
int written = 0;
hrt_abstime last_fsync = hrt_absolute_time();
while (true) {
size_t available = 0;
@ -263,12 +267,15 @@ void LogWriterFile::run()
written = ::write(_fd, read_ptr, available);
perf_end(_perf_write);
const hrt_abstime now = hrt_absolute_time();
/* call fsync periodically to minimize potential loss of data */
if (++poll_count >= 100) {
if (++poll_count >= 100 || now - last_fsync > 1_s) {
perf_begin(_perf_fsync);
::fsync(_fd);
perf_end(_perf_fsync);
poll_count = 0;
last_fsync = now;
}
if (written < 0) {