Hello Vivek, On Thu, 13 Sep 2012 10:10:18 -0400 Vivek Goyal <vgoyal at redhat.com> wrote: > Hi Atsushi-san, > > How is size of cyclic buffer decided with 1.5.0? In practice I don't think > asking user for the size is a good idea as user does not know how much > memory will be left after kernel boot. As you said, I don't think asking user for the size is a smart way, either. So, I agree with your basic idea explained in below. > Will it make sense for makedumpfile to automatically determine the buffer > size based on amount of free memory available in the system. Something > like use 70-80% of free memory as cyclic buffer. Now, I think makedumpfile should automatically choose the lesser of the two below as the size of cyclic buffer when the size isn't specified: a. the size enough for storing the 1st/2nd bitmap for the whole of vmcore b. the limit size (e.g. 70-80% of free memory) However, I don't have a good idea how to determine the appropriate size for the case of "b". If someone have a idea for the limit size, please let me know. By the way, I'll be on long vacation until Sep 30, so I can't reply. Thanks Atsushi kumagai
