Hi,
From what knowledge I have, the dirty bit in the page table entry of a
page is used to indicate whether the page has been modified. I suppose its
usage is for knowing if this page has been written to the buffer cache (to
be written to the disk later), before swapping it out. But this is in case
of pages to be read/written to the I/O. What is the use of the dirty bit in
case of shared memory? I saw that the swapper wont swap out dirty pages and
thus doesnt swap out the shared memory pages which is needed. Is there any
other use pf the dirty buit in case shared memory pages? Correct me if I am
wrong anywhere here!!
Thanks in advance,
-Asmita from MAASK
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