Messages in this thread |  | | | Date | Wed, 27 Apr 2011 06:18:44 +0300 | | From | Alexey Dobriyan <> | | Subject | Re: How to export information larger than PROC_BLOCK_SIZE via /proc file system? |
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On Wed, Apr 27, 2011 at 11:00:32AM +0800, Am??rico Wang wrote: > On Wed, Apr 27, 2011 at 8:54 AM, Jidong Xiao <jidong.xiao@gmail.com> wrote: > > Hi, > > > > I am tracing some data inside the kernel, and I plan to export the > > tracing data through /proc file system. I created a file under /proc > > file system, and I use cat to display the tracing data. However, every > > time there is only 3072 bytes data displayed, which is the size > > defined by PROC_BLOCK_SIZE. And I wonder that how to export > > information more than that limit? Judging from the function > > fs/proc/generic.c/proc_file_read(), if the size returned by my > > read_proc function is large than a PAGE_SIZE, then I will get a > > KERN_ERR message which says "proc_file_read: Apparent buffer > > overflow!". Any help would be appreciated! > > > > Why not switch to use debugfs?
Or use seq_file/proc_create.
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