+ mm-damon-sysfs-support-fixed-virtual-address-ranges-monitoring.patch added to -mm tree

+ mm-damon-sysfs-support-fixed-virtual-address-ranges-monitoring.patch added to -mm tree

[Andrew Morton]

The patch titled
     Subject: mm/damon/sysfs: support fixed virtual address ranges monitoring
has been added to the -mm tree.  Its filename is
     mm-damon-sysfs-support-fixed-virtual-address-ranges-monitoring.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-damon-sysfs-support-fixed-virtual-address-ranges-monitoring.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-damon-sysfs-support-fixed-virtual-address-ranges-monitoring.patch

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------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/sysfs: support fixed virtual address ranges monitoring

This commit makes DAMON sysfs interface to support the fixed virtual
address ranges monitoring.  After this commit, writing 'fvaddr' to the
'operations' DAMON sysfs file makes DAMON uses the monitoring operations
set for fixed virtual address ranges, so that users can monitor accesses
to only interested virtual address ranges.

Link: https://lkml.kernel.org/r/20220426231750.48822-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/sysfs.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

--- a/mm/damon/sysfs.c~mm-damon-sysfs-support-fixed-virtual-address-ranges-monitoring
+++ a/mm/damon/sysfs.c
@@ -1694,7 +1694,7 @@ static struct kobj_type damon_sysfs_attr
 /* This should match with enum damon_ops_id */
 static const char * const damon_sysfs_ops_strs[] = {
 	"vaddr",
-	"unsupported",	/* fvaddr is not supported by sysfs yet */
+	"fvaddr",
 	"paddr",
 };
 
@@ -1844,9 +1844,6 @@ static ssize_t operations_store(struct k
 
 	for (id = 0; id < NR_DAMON_OPS; id++) {
 		if (sysfs_streq(buf, damon_sysfs_ops_strs[id])) {
-			/* fvaddr is not supported by sysfs yet */
-			if (id == DAMON_OPS_FVADDR)
-				return -EINVAL;
 			context->ops_id = id;
 			return count;
 		}
@@ -2136,7 +2133,8 @@ static int damon_sysfs_set_targets(struc
 			damon_sysfs_destroy_targets(ctx);
 			return -ENOMEM;
 		}
-		if (ctx->ops.id == DAMON_OPS_VADDR) {
+		if (ctx->ops.id == DAMON_OPS_VADDR ||
+				ctx->ops.id == DAMON_OPS_FVADDR) {
 			t->pid = find_get_pid(sys_target->pid);
 			if (!t->pid) {
 				damon_sysfs_destroy_targets(ctx);
_

Patches currently in -mm which might be from sj@kernel.org are

mm-damon-core-test-add-a-kunit-test-case-for-ops-registration.patch
mm-damon-core-add-a-function-for-damon_operations-registration-checks.patch
mm-damon-sysfs-add-a-file-for-listing-available-monitoring-ops.patch
selftets-damon-sysfs-test-existence-and-permission-of-avail_operations.patch
docs-abiadmin-guide-damon-document-avail_operations-sysfs-file.patch
mm-damon-vaddr-register-a-damon_operations-for-fixed-virtual-address-ranges-monitoring.patch
mm-damon-sysfs-support-fixed-virtual-address-ranges-monitoring.patch
docs-abiadmin-guide-damon-update-for-fixed-virtual-address-ranges-monitoring.patch