58  * Functions for the initial monitoring target regions construction
62  * Size-evenly split a region into 'nr_pieces' small regions
116  * Find three regions separated by two biggest unmapped regions
119  * regions	an array of three address ranges that results will be saved
121  * This function receives an address space and finds three regions in it which
122  * separated by the two biggest unmapped regions in the space.  Please refer to
129 				       struct damon_addr_range regions[3])  in __damon_va_three_regions()
169 	regions[0].start = ALIGN(start, DAMON_MIN_REGION);  in __damon_va_three_regions()
170 	regions[0].end = ALIGN(first_gap.start, DAMON_MIN_REGION);  in __damon_va_three_regions()
171 	regions[1].start = ALIGN(first_gap.end, DAMON_MIN_REGION);  in __damon_va_three_regions()
172 	regions[1].end = ALIGN(second_gap.start, DAMON_MIN_REGION);  in __damon_va_three_regions()
173 	regions[2].start = ALIGN(second_gap.end, DAMON_MIN_REGION);  in __damon_va_three_regions()
174 	regions[2].end = ALIGN(last_vma->vm_end, DAMON_MIN_REGION);  in __damon_va_three_regions()
180  * Get the three regions in the given target (task)
185 				struct damon_addr_range regions[3])  in damon_va_three_regions()
195 	rc = __damon_va_three_regions(mm->mmap, regions);  in damon_va_three_regions()
203  * Initialize the monitoring target regions for the given target (task)
209  * regions is wasteful.  That said, because we can deal with small noises,
212  * high.  The adaptive regions adjustment mechanism will further help to deal
219  * For the reason, we convert the complex mappings to three distinct regions
221  * between the three regions are the two biggest unmapped areas in the given
224  * Then, it constructs the three regions as below:
232  * region and the stack will be two biggest unmapped regions.  Because these
234  * two biggest unmapped regions will be sufficient to make a trade-off.
239  *   (other mmap()-ed regions and small unmapped regions)
248 	struct damon_addr_range regions[3];  in __damon_va_init_regions()  local
252 	if (damon_va_three_regions(t, regions)) {  in __damon_va_init_regions()
253 		pr_err("Failed to get three regions of target %lu\n", t->id);  in __damon_va_init_regions()
258 		sz += regions[i].end - regions[i].start;  in __damon_va_init_regions()
264 	/* Set the initial three regions of the target */  in __damon_va_init_regions()
266 		r = damon_new_region(regions[i].start, regions[i].end);  in __damon_va_init_regions()
273 		nr_pieces = (regions[i].end - regions[i].start) / sz;  in __damon_va_init_regions()
284 		/* the user may set the target regions as they want */  in damon_va_init()
291  * Functions for the dynamic monitoring target regions update
305  * Update damon regions for the three big regions of the given target
308  * bregions	the three big regions of the target
316 	/* Remove regions which are not in the three big regions now */  in damon_va_apply_three_regions()
326 	/* Adjust intersecting regions to fit with the three big regions */  in damon_va_apply_three_regions()
333 		/* Get the first and last regions which intersects with br */  in damon_va_apply_three_regions()
361  * Update regions for current memory mappings
490  * Functions for the access checking of the regions