While looking at the code in vfs_bio.c, I notice the existence of low and
high free buffer counters. The comments say they are there to give some
special process like buf daemon access to emergence reserve. I just
don't get the reason for having this emergence reserve. Do we allocate
buffer in an interrupt environment? Do we need extra buffers in order to
free buffers? Please shed a light on this for me. Thanks.
-Zhihui
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