PG_locked flag and MAP_SHARED

[arvind k <arvind_000@xxxxxxxxx>]

Hi All,

I understand that PG_locked flag is set in page->flags
before initiating I/O on a page to avoid parallel
I/Os. But I am wondering how we avoid other processes
and threads from accessing the same page in userspace
if it is mapped(MAP_SHARED) to the address space of
multiple processes.

Could somebody please throw some light on this.

Thanks & Regards,
Arvind.


	
		
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