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mm/damon/sysfs: support fixed virtual address ranges monitoring

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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.

[sj@kernel.org: fix pid leak under fvaddr ops use case]
  Link: https://lkml.kernel.org/r/20220503220531.45913-1-sj@kernel.org
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>
This commit is contained in:
SeongJae Park 2022-05-09 18:20:52 -07:00 committed by Andrew Morton
parent de6d01542a
commit b82434471c
1 changed files with 6 additions and 7 deletions
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13
mm/damon/sysfs.c
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@ -1694,7 +1694,7 @@ static struct kobj_type damon_sysfs_attrs_ktype = {
/* 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 kobject *kobj,
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;
}
@ -2089,7 +2086,8 @@ static void damon_sysfs_destroy_targets(struct damon_ctx *ctx)
struct damon_target *t, *next;
damon_for_each_target_safe(t, next, ctx) {
if (ctx->ops.id == DAMON_OPS_VADDR)
if (ctx->ops.id == DAMON_OPS_VADDR ||
ctx->ops.id == DAMON_OPS_FVADDR)
put_pid(t->pid);
damon_destroy_target(t);
}
@ -2136,7 +2134,8 @@ static int damon_sysfs_set_targets(struct damon_ctx *ctx,
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);
@ -2206,7 +2205,7 @@ static void damon_sysfs_before_terminate(struct damon_ctx *ctx)
{
struct damon_target *t, *next;
if (ctx->ops.id != DAMON_OPS_VADDR)
if (ctx->ops.id != DAMON_OPS_VADDR && ctx->ops.id != DAMON_OPS_FVADDR)
return;
mutex_lock(&ctx->kdamond_lock);