Messages in this thread | | | Date | Wed, 27 Apr 2011 00:16:35 -0400 | Subject | Re: How to export information larger than PROC_BLOCK_SIZE via /proc file system? | From | Jidong Xiao <> |
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On Tue, Apr 26, 2011 at 11:18 PM, Alexey Dobriyan <adobriyan@gmail.com> wrote: > 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. >
Oh, thank you two very much. After reading the related document, I feel seq_file is exactly what I am looking for.
Regards Jidong
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