56  * Functions for the initial monitoring target regions construction
60  * Size-evenly split a region into 'nr_pieces' small regions
104  * Find three regions separated by two biggest unmapped regions
107  * regions	an array of three address ranges that results will be saved
109  * This function receives an address space and finds three regions in it which
110  * separated by the two biggest unmapped regions in the space.  Please refer to
117 				       struct damon_addr_range regions[3])  in __damon_va_three_regions()
158 	regions[0].start = ALIGN(start, DAMON_MIN_REGION);  in __damon_va_three_regions()
159 	regions[0].end = ALIGN(first_gap.start, DAMON_MIN_REGION);  in __damon_va_three_regions()
160 	regions[1].start = ALIGN(first_gap.end, DAMON_MIN_REGION);  in __damon_va_three_regions()
161 	regions[1].end = ALIGN(second_gap.start, DAMON_MIN_REGION);  in __damon_va_three_regions()
162 	regions[2].start = ALIGN(second_gap.end, DAMON_MIN_REGION);  in __damon_va_three_regions()
163 	regions[2].end = ALIGN(prev->vm_end, DAMON_MIN_REGION);  in __damon_va_three_regions()
169  * Get the three regions in the given target (task)
174 				struct damon_addr_range regions[3])  in damon_va_three_regions()
184 	rc = __damon_va_three_regions(mm, regions);  in damon_va_three_regions()
192  * Initialize the monitoring target regions for the given target (task)
198  * regions is wasteful.  That said, because we can deal with small noises,
201  * high.  The adaptive regions adjustment mechanism will further help to deal
208  * For the reason, we convert the complex mappings to three distinct regions
210  * between the three regions are the two biggest unmapped areas in the given
213  * Then, it constructs the three regions as below:
221  * region and the stack will be two biggest unmapped regions.  Because these
223  * two biggest unmapped regions will be sufficient to make a trade-off.
228  *   (other mmap()-ed regions and small unmapped regions)
238 	struct damon_addr_range regions[3];  in __damon_va_init_regions()  local
242 	if (damon_va_three_regions(t, regions)) {  in __damon_va_init_regions()
248 		pr_debug("Failed to get three regions of %dth target\n", tidx);  in __damon_va_init_regions()
253 		sz += regions[i].end - regions[i].start;  in __damon_va_init_regions()
259 	/* Set the initial three regions of the target */  in __damon_va_init_regions()
261 		r = damon_new_region(regions[i].start, regions[i].end);  in __damon_va_init_regions()
268 		nr_pieces = (regions[i].end - regions[i].start) / sz;  in __damon_va_init_regions()
279 		/* the user may set the target regions as they want */  in damon_va_init()
286  * Update regions for current memory mappings
404  * Functions for the access checking of the regions
720 	/* Don't set the monitoring target regions for the entire mapping */  in damon_va_initcall()