* What will happen on attempt to write to read-only page when CONFIG_MEM_SOFT_DIRTY is off ?
@ 2019-03-11 7:27 Lev Olshvang
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From: Lev Olshvang @ 2019-03-11 7:27 UTC (permalink / raw)
To: kernelnewbies, linux-il
Hello all,
Please help me to clarify what will page fault handler do (if any)
File arch/x86/include/asm/pgtable_types.h have following comment for 2 PAGE_DIRTY_BITs
#define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
_PAGE_BIT_SOFT_DIRTY _PAGE_BIT_SOFTW3 /* software dirty tracking */
While documentation clearly explains that Page Fault handler sets second flag
https://www.kernel.org/doc/Documentation/vm/soft-dirty.txt
I do not have idea what will happen when tracking Soft Dirty flags is off, I suppose the answer is in mm/gup.c
but I was not able to track it to page handler.
Thanks you all.
Lev.
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2019-03-11 7:27 What will happen on attempt to write to read-only page when CONFIG_MEM_SOFT_DIRTY is off ? Lev Olshvang
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