Hi Kaixu, On Fri, 26 Aug 2022 16:31:18 +0800 xiakaixu1987@xxxxxxxxx wrote: > From: Kaixu Xia <kaixuxia@xxxxxxxxxxx> > > The damon regions that belong to the same damon target have the same > 'struct mm_struct *mm', so it's unnecessary to compare the mm and last_mm > objects among the damon regions in one damon target when checking accesses. There could be multiple targets, and 'damon_va_check_accesses()' calls '__damon_va_check_accesses()' for all the targets. However, 'damon_va_check_accesses()' doesn't note if '__damon_va_check_accesses()' is called with a target that same to the target it was called with for the last time. Hence the check is necessary. If I'm missing something, please let me know. Thanks, SJ [...]
