/proc/stat page in and out values

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howdy,

In /proc/stat the record as

page x y

which indicates cumulative page in and out values.
To my best undertstanding this info is stored in
kstat.pgpgin and kstat.pgpgout.

However the values are incremented in submit_bh in
ll_rw_blk.c. So are we actually counting the buffers
we write in and out or the pages; or is it the same ?

thanks
Ravi

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