[Libva] fflush inside va_trace (with network drivers)

[Osin, Alexander I]

Note:
2nd case analogue is "fsync(fileno(...));". It's ok for btrfs and ext4. I believe it would be enough. I'll prepare patch (with fsync) for you review.

-----Original Message-----
From: Osin, Alexander I 
Sent: Friday, June 17, 2011 12:56 PM
To: libva at lists.freedesktop.org
Subject: [Libva] fflush inside va_trace (with network drivers)

	Hi,
	I have started to debug "segmentation fault" and hangs in video driver stack. I found that our libva tracing doesn't work in some cases.
	The issue: 'fflush' is not supported by some network file system drivers.

	I see three paths:
1) Use 'fclose trick' instead of fflush. We can add new option in /etc/libva.conf for switching between fflush (default) and fclose.
2) Replace existing high level IO tracing (fopen, etc) by low level (open, etc). After that we can use ioctl(...,
FIOSYNC,...). But some drivers do not support FIOSYNC then it's not 100% solution.
3) Keep current va tracing. It works ok for most cases.
	
	Do you know other workarounds?
	Guys, what do you think?

Thanks,
Alexander

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