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To prepare for further expansion of the support for other address spaces including physical memory, this commit modifies one of its core struct, 'struct damon_region' to use virtual memory independent address space concept. Signed-off-by: SeongJae Park --- include/linux/damon.h | 20 +++++++++++------ mm/damon-test.h | 42 ++++++++++++++++++------------------ mm/damon.c | 50 +++++++++++++++++++++---------------------- 3 files changed, 59 insertions(+), 53 deletions(-) diff --git a/include/linux/damon.h b/include/linux/damon.h index e77256cf30dd..b4b06ca905a2 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -16,11 +16,18 @@ #include /** - * struct damon_region - Represents a monitoring target region of - * [@vm_start, @vm_end). - * - * @vm_start: Start address of the region (inclusive). - * @vm_end: End address of the region (exclusive). + * struct damon_addr_range - Represents an address region of [@start, @end). + * @start: Start address of the region (inclusive). + * @end: End address of the region (exclusive). + */ +struct damon_addr_range { + unsigned long start; + unsigned long end; +}; + +/** + * struct damon_region - Represents a monitoring target region. + * @ar: The address range of the region. * @sampling_addr: Address of the sample for the next access check. * @nr_accesses: Access frequency of this region. * @list: List head for siblings. @@ -33,8 +40,7 @@ * region are set as region size-weighted average of those of the two regions. */ struct damon_region { - unsigned long vm_start; - unsigned long vm_end; + struct damon_addr_range ar; unsigned long sampling_addr; unsigned int nr_accesses; struct list_head list; diff --git a/mm/damon-test.h b/mm/damon-test.h index 5b18619efe72..9dd2061502cb 100644 --- a/mm/damon-test.h +++ b/mm/damon-test.h @@ -78,8 +78,8 @@ static void damon_test_regions(struct kunit *test) struct damon_task *t; r = damon_new_region(&damon_user_ctx, 1, 2); - KUNIT_EXPECT_EQ(test, 1ul, r->vm_start); - KUNIT_EXPECT_EQ(test, 2ul, r->vm_end); + KUNIT_EXPECT_EQ(test, 1ul, r->ar.start); + KUNIT_EXPECT_EQ(test, 2ul, r->ar.end); KUNIT_EXPECT_EQ(test, 0u, r->nr_accesses); t = damon_new_task(42); @@ -267,7 +267,7 @@ static void damon_test_aggregate(struct kunit *test) KUNIT_EXPECT_EQ(test, 3, it); /* The aggregated information should be written in the buffer */ - sr = sizeof(r->vm_start) + sizeof(r->vm_end) + sizeof(r->nr_accesses); + sr = sizeof(r->ar.start) + sizeof(r->ar.end) + sizeof(r->nr_accesses); sp = sizeof(t->pid) + sizeof(unsigned int) + 3 * sr; sz = sizeof(struct timespec64) + sizeof(unsigned int) + 3 * sp; KUNIT_EXPECT_EQ(test, (unsigned int)sz, ctx->rbuf_offset); @@ -350,8 +350,8 @@ static void damon_do_test_apply_three_regions(struct kunit *test, for (i = 0; i < nr_expected / 2; i++) { r = __nth_region_of(t, i); - KUNIT_EXPECT_EQ(test, r->vm_start, expected[i * 2]); - KUNIT_EXPECT_EQ(test, r->vm_end, expected[i * 2 + 1]); + KUNIT_EXPECT_EQ(test, r->ar.start, expected[i * 2]); + KUNIT_EXPECT_EQ(test, r->ar.end, expected[i * 2 + 1]); } damon_cleanup_global_state(); @@ -470,8 +470,8 @@ static void damon_test_split_evenly(struct kunit *test) i = 0; damon_for_each_region(r, t) { - KUNIT_EXPECT_EQ(test, r->vm_start, i++ * 10); - KUNIT_EXPECT_EQ(test, r->vm_end, i * 10); + KUNIT_EXPECT_EQ(test, r->ar.start, i++ * 10); + KUNIT_EXPECT_EQ(test, r->ar.end, i * 10); } damon_free_task(t); @@ -485,11 +485,11 @@ static void damon_test_split_evenly(struct kunit *test) damon_for_each_region(r, t) { if (i == 4) break; - KUNIT_EXPECT_EQ(test, r->vm_start, 5 + 10 * i++); - KUNIT_EXPECT_EQ(test, r->vm_end, 5 + 10 * i); + KUNIT_EXPECT_EQ(test, r->ar.start, 5 + 10 * i++); + KUNIT_EXPECT_EQ(test, r->ar.end, 5 + 10 * i); } - KUNIT_EXPECT_EQ(test, r->vm_start, 5 + 10 * i); - KUNIT_EXPECT_EQ(test, r->vm_end, 59ul); + KUNIT_EXPECT_EQ(test, r->ar.start, 5 + 10 * i); + KUNIT_EXPECT_EQ(test, r->ar.end, 59ul); damon_free_task(t); t = damon_new_task(42); @@ -499,8 +499,8 @@ static void damon_test_split_evenly(struct kunit *test) KUNIT_EXPECT_EQ(test, nr_damon_regions(t), 1u); damon_for_each_region(r, t) { - KUNIT_EXPECT_EQ(test, r->vm_start, 5ul); - KUNIT_EXPECT_EQ(test, r->vm_end, 6ul); + KUNIT_EXPECT_EQ(test, r->ar.start, 5ul); + KUNIT_EXPECT_EQ(test, r->ar.end, 6ul); } damon_free_task(t); } @@ -514,12 +514,12 @@ static void damon_test_split_at(struct kunit *test) r = damon_new_region(&damon_user_ctx, 0, 100); damon_add_region(r, t); damon_split_region_at(&damon_user_ctx, r, 25); - KUNIT_EXPECT_EQ(test, r->vm_start, 0ul); - KUNIT_EXPECT_EQ(test, r->vm_end, 25ul); + KUNIT_EXPECT_EQ(test, r->ar.start, 0ul); + KUNIT_EXPECT_EQ(test, r->ar.end, 25ul); r = damon_next_region(r); - KUNIT_EXPECT_EQ(test, r->vm_start, 25ul); - KUNIT_EXPECT_EQ(test, r->vm_end, 100ul); + KUNIT_EXPECT_EQ(test, r->ar.start, 25ul); + KUNIT_EXPECT_EQ(test, r->ar.end, 100ul); damon_free_task(t); } @@ -539,8 +539,8 @@ static void damon_test_merge_two(struct kunit *test) damon_add_region(r2, t); damon_merge_two_regions(r, r2); - KUNIT_EXPECT_EQ(test, r->vm_start, 0ul); - KUNIT_EXPECT_EQ(test, r->vm_end, 300ul); + KUNIT_EXPECT_EQ(test, r->ar.start, 0ul); + KUNIT_EXPECT_EQ(test, r->ar.end, 300ul); KUNIT_EXPECT_EQ(test, r->nr_accesses, 16u); i = 0; @@ -577,8 +577,8 @@ static void damon_test_merge_regions_of(struct kunit *test) KUNIT_EXPECT_EQ(test, nr_damon_regions(t), 5u); for (i = 0; i < 5; i++) { r = __nth_region_of(t, i); - KUNIT_EXPECT_EQ(test, r->vm_start, saddrs[i]); - KUNIT_EXPECT_EQ(test, r->vm_end, eaddrs[i]); + KUNIT_EXPECT_EQ(test, r->ar.start, saddrs[i]); + KUNIT_EXPECT_EQ(test, r->ar.end, eaddrs[i]); } damon_free_task(t); } diff --git a/mm/damon.c b/mm/damon.c index ea6a8b6886b8..a9676b804b0b 100644 --- a/mm/damon.c +++ b/mm/damon.c @@ -80,7 +80,7 @@ static struct damon_ctx damon_user_ctx = { * Returns the pointer to the new struct if success, or NULL otherwise */ static struct damon_region *damon_new_region(struct damon_ctx *ctx, - unsigned long vm_start, unsigned long vm_end) + unsigned long start, unsigned long end) { struct damon_region *region; @@ -88,8 +88,8 @@ static struct damon_region *damon_new_region(struct damon_ctx *ctx, if (!region) return NULL; - region->vm_start = vm_start; - region->vm_end = vm_end; + region->ar.start = start; + region->ar.end = end; region->nr_accesses = 0; INIT_LIST_HEAD(®ion->list); @@ -277,16 +277,16 @@ static int damon_split_region_evenly(struct damon_ctx *ctx, if (!r || !nr_pieces) return -EINVAL; - orig_end = r->vm_end; - sz_orig = r->vm_end - r->vm_start; + orig_end = r->ar.end; + sz_orig = r->ar.end - r->ar.start; sz_piece = ALIGN_DOWN(sz_orig / nr_pieces, MIN_REGION); if (!sz_piece) return -EINVAL; - r->vm_end = r->vm_start + sz_piece; + r->ar.end = r->ar.start + sz_piece; next = damon_next_region(r); - for (start = r->vm_end; start + sz_piece <= orig_end; + for (start = r->ar.end; start + sz_piece <= orig_end; start += sz_piece) { n = damon_new_region(ctx, start, start + sz_piece); if (!n) @@ -296,7 +296,7 @@ static int damon_split_region_evenly(struct damon_ctx *ctx, } /* complement last region for possible rounding error */ if (n) - n->vm_end = orig_end; + n->ar.end = orig_end; return 0; } @@ -509,7 +509,7 @@ static void damon_mkold(struct mm_struct *mm, unsigned long addr) static void damon_prepare_access_check(struct damon_ctx *ctx, struct mm_struct *mm, struct damon_region *r) { - r->sampling_addr = damon_rand(r->vm_start, r->vm_end); + r->sampling_addr = damon_rand(r->ar.start, r->ar.end); damon_mkold(mm, r->sampling_addr); } @@ -709,12 +709,12 @@ static void kdamond_reset_aggregated(struct damon_ctx *c) nr = nr_damon_regions(t); damon_write_rbuf(c, &nr, sizeof(nr)); damon_for_each_region(r, t) { - damon_write_rbuf(c, &r->vm_start, sizeof(r->vm_start)); - damon_write_rbuf(c, &r->vm_end, sizeof(r->vm_end)); + damon_write_rbuf(c, &r->ar.start, sizeof(r->ar.start)); + damon_write_rbuf(c, &r->ar.end, sizeof(r->ar.end)); damon_write_rbuf(c, &r->nr_accesses, sizeof(r->nr_accesses)); trace_damon_aggregated(t->pid, nr, - r->vm_start, r->vm_end, r->nr_accesses); + r->ar.start, r->ar.end, r->nr_accesses); r->last_nr_accesses = r->nr_accesses; r->nr_accesses = 0; } @@ -742,8 +742,8 @@ static int damos_madvise(struct damon_task *task, struct damon_region *r, if (!mm) goto put_task_out; - ret = do_madvise(t, mm, PAGE_ALIGN(r->vm_start), - PAGE_ALIGN(r->vm_end - r->vm_start), behavior); + ret = do_madvise(t, mm, PAGE_ALIGN(r->ar.start), + PAGE_ALIGN(r->ar.end - r->ar.start), behavior); mmput(mm); put_task_out: put_task_struct(t); @@ -790,7 +790,7 @@ static void damon_do_apply_schemes(struct damon_ctx *c, struct damon_task *t, unsigned long sz; damon_for_each_scheme(s, c) { - sz = r->vm_end - r->vm_start; + sz = r->ar.end - r->ar.start; if ((s->min_sz_region && sz < s->min_sz_region) || (s->max_sz_region && s->max_sz_region < sz)) continue; @@ -821,7 +821,7 @@ static void kdamond_apply_schemes(struct damon_ctx *c) } } -#define sz_damon_region(r) (r->vm_end - r->vm_start) +#define sz_damon_region(r) (r->ar.end - r->ar.start) /* * Merge two adjacent regions into one region @@ -834,7 +834,7 @@ static void damon_merge_two_regions(struct damon_region *l, l->nr_accesses = (l->nr_accesses * sz_l + r->nr_accesses * sz_r) / (sz_l + sz_r); l->age = (l->age * sz_l + r->age * sz_r) / (sz_l + sz_r); - l->vm_end = r->vm_end; + l->ar.end = r->ar.end; damon_destroy_region(r); } @@ -856,7 +856,7 @@ static void damon_merge_regions_of(struct damon_task *t, unsigned int thres) else r->age++; - if (prev && prev->vm_end == r->vm_start && + if (prev && prev->ar.end == r->ar.start && diff_of(prev->nr_accesses, r->nr_accesses) <= thres) damon_merge_two_regions(prev, r); else @@ -893,8 +893,8 @@ static void damon_split_region_at(struct damon_ctx *ctx, { struct damon_region *new; - new = damon_new_region(ctx, r->vm_start + sz_r, r->vm_end); - r->vm_end = new->vm_start; + new = damon_new_region(ctx, r->ar.start + sz_r, r->ar.end); + r->ar.end = new->ar.start; new->age = r->age; new->last_nr_accesses = r->last_nr_accesses; @@ -911,7 +911,7 @@ static void damon_split_regions_of(struct damon_ctx *ctx, int i; damon_for_each_region_safe(r, next, t) { - sz_region = r->vm_end - r->vm_start; + sz_region = r->ar.end - r->ar.start; for (i = 0; i < nr_subs - 1 && sz_region > 2 * MIN_REGION; i++) { @@ -985,7 +985,7 @@ static bool kdamond_need_update_regions(struct damon_ctx *ctx) */ static bool damon_intersect(struct damon_region *r, struct region *re) { - return !(r->vm_end <= re->start || re->end <= r->vm_start); + return !(r->ar.end <= re->start || re->end <= r->ar.start); } /* @@ -1024,7 +1024,7 @@ static void damon_apply_three_regions(struct damon_ctx *ctx, first = r; last = r; } - if (r->vm_start >= br->end) + if (r->ar.start >= br->end) break; } if (!first) { @@ -1036,8 +1036,8 @@ static void damon_apply_three_regions(struct damon_ctx *ctx, continue; damon_insert_region(newr, damon_prev_region(r), r); } else { - first->vm_start = ALIGN_DOWN(br->start, MIN_REGION); - last->vm_end = ALIGN(br->end, MIN_REGION); + first->ar.start = ALIGN_DOWN(br->start, MIN_REGION); + last->ar.end = ALIGN(br->end, MIN_REGION); } } } -- 2.17.1