| Message ID | 20250203225604.44742-4-usamaarif642@gmail.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mm/damon: add support for hugepages | expand |
On Mon, 3 Feb 2025 22:55:30 +0000 Usama Arif <usamaarif642@gmail.com> wrote: > Add min and max files for damon filters to let the userspace decide > the min/max folio size to operate on. This will be needed to decide > what folio sizes to give pa_stat for. I'd prefer implementing the logic with API interface first, and then implementing sysfs interface on top of the API. > > Signed-off-by: Usama Arif <usamaarif642@gmail.com> > --- > include/linux/damon.h | 11 +++++++++ > mm/damon/core.c | 3 +++ > mm/damon/sysfs-schemes.c | 53 ++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 67 insertions(+) > > diff --git a/include/linux/damon.h b/include/linux/damon.h > index af525252b853..6f30ceeff215 100644 > --- a/include/linux/damon.h > +++ b/include/linux/damon.h > @@ -35,6 +35,16 @@ struct damon_addr_range { > unsigned long end; > }; > > +/** > + * struct damon_folio_size - Represents size of folio filter on [@min, @max]. > + * @min: Min size of the folio (inclusive). > + * @max: Max size of the folio (inclusive). > + */ > +struct damon_folio_size { > + unsigned long min; > + unsigned long max; > +}; > + I'd suggest giving a more general name, say, damon_size_range, so that we can reuse this for any possible future size range based filters or whatever. > /** > * struct damon_region - Represents a monitoring target region. > * @ar: The address range of the region. > @@ -377,6 +387,7 @@ struct damos_filter { > struct damon_addr_range addr_range; > int target_idx; > }; > + struct damon_folio_size folio_size; As this will be used depending on damos_filter->type, let's add this field in the above union, together with addr_range and target_idx. Also, I'd prefer calling this hugepage_size, as we discussed on the previous version of this patch series. > struct list_head list; > }; > > diff --git a/mm/damon/core.c b/mm/damon/core.c > index c7b981308862..27323e3a800d 100644 > --- a/mm/damon/core.c > +++ b/mm/damon/core.c > @@ -776,6 +776,9 @@ static void damos_commit_filter_arg( > case DAMOS_FILTER_TYPE_TARGET: > dst->target_idx = src->target_idx; > break; > + case DAMOS_FILTER_TYPE_HUGEPAGE: > + dst->folio_size = src->folio_size; > + break; > default: > break; > } > diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c > index 98f93ae9f59e..bc7ca43ca9c4 100644 > --- a/mm/damon/sysfs-schemes.c > +++ b/mm/damon/sysfs-schemes.c > @@ -316,6 +316,7 @@ struct damon_sysfs_scheme_filter { > bool allow; > char *memcg_path; > struct damon_addr_range addr_range; > + struct damon_folio_size folio_size; Again, I'd prefer calling this hugepage_size. > int target_idx; > }; > > @@ -469,6 +470,43 @@ static ssize_t addr_end_store(struct kobject *kobj, > struct damon_sysfs_scheme_filter *filter = container_of(kobj, > struct damon_sysfs_scheme_filter, kobj); > int err = kstrtoul(buf, 0, &filter->addr_range.end); > + return err ? err : count; > +} Let's keep the blank line before 'return' so that this is not unnecessarily marked as a diff. > + > +static ssize_t min_show(struct kobject *kobj, > + struct kobj_attribute *attr, char *buf) > +{ > + struct damon_sysfs_scheme_filter *filter = container_of(kobj, > + struct damon_sysfs_scheme_filter, kobj); > + > + return sysfs_emit(buf, "%lu\n", filter->folio_size.min); > +} > + > +static ssize_t min_store(struct kobject *kobj, > + struct kobj_attribute *attr, const char *buf, size_t count) > +{ > + struct damon_sysfs_scheme_filter *filter = container_of(kobj, > + struct damon_sysfs_scheme_filter, kobj); > + int err = kstrtoul(buf, 0, &filter->folio_size.min); > + > + return err ? err : count; > +} > + > +static ssize_t max_show(struct kobject *kobj, > + struct kobj_attribute *attr, char *buf) > +{ > + struct damon_sysfs_scheme_filter *filter = container_of(kobj, > + struct damon_sysfs_scheme_filter, kobj); > + > + return sysfs_emit(buf, "%lu\n", filter->folio_size.max); > +} > + > +static ssize_t max_store(struct kobject *kobj, > + struct kobj_attribute *attr, const char *buf, size_t count) > +{ > + struct damon_sysfs_scheme_filter *filter = container_of(kobj, > + struct damon_sysfs_scheme_filter, kobj); > + int err = kstrtoul(buf, 0, &filter->folio_size.max); > > return err ? err : count; > } > @@ -519,6 +557,12 @@ static struct kobj_attribute damon_sysfs_scheme_filter_addr_start_attr = > static struct kobj_attribute damon_sysfs_scheme_filter_addr_end_attr = > __ATTR_RW_MODE(addr_end, 0600); > > +static struct kobj_attribute damon_sysfs_scheme_filter_min_attr = > + __ATTR_RW_MODE(min, 0600); > + > +static struct kobj_attribute damon_sysfs_scheme_filter_max_attr = > + __ATTR_RW_MODE(max, 0600); > + > static struct kobj_attribute damon_sysfs_scheme_filter_damon_target_idx_attr = > __ATTR_RW_MODE(damon_target_idx, 0600); > > @@ -529,6 +573,8 @@ static struct attribute *damon_sysfs_scheme_filter_attrs[] = { > &damon_sysfs_scheme_filter_memcg_path_attr.attr, > &damon_sysfs_scheme_filter_addr_start_attr.attr, > &damon_sysfs_scheme_filter_addr_end_attr.attr, > + &damon_sysfs_scheme_filter_min_attr.attr, > + &damon_sysfs_scheme_filter_max_attr.attr, > &damon_sysfs_scheme_filter_damon_target_idx_attr.attr, > NULL, > }; > @@ -1953,6 +1999,13 @@ static int damon_sysfs_add_scheme_filters(struct damos *scheme, > filter->addr_range = sysfs_filter->addr_range; > } else if (filter->type == DAMOS_FILTER_TYPE_TARGET) { > filter->target_idx = sysfs_filter->target_idx; > + } else if (filter->type == DAMOS_FILTER_TYPE_HUGEPAGE) { > + if (sysfs_filter->folio_size.min > > + sysfs_filter->folio_size.max) { > + damos_destroy_filter(filter); > + return -EINVAL; > + } I don't think letting users set invalid min/max is a real problem, as long as the implementation will handle the case (no memory matches the filter). Let's just allow it, like addr_range case. If we really need to disallow this, it would better to do that from damos_commit_filter() like central point. > + filter->folio_size = sysfs_filter->folio_size; > } > > damos_add_filter(scheme, filter); > -- > 2.43.5 Thanks, SJ
diff --git a/include/linux/damon.h b/include/linux/damon.h index af525252b853..6f30ceeff215 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -35,6 +35,16 @@ struct damon_addr_range { unsigned long end; }; +/** + * struct damon_folio_size - Represents size of folio filter on [@min, @max]. + * @min: Min size of the folio (inclusive). + * @max: Max size of the folio (inclusive). + */ +struct damon_folio_size { + unsigned long min; + unsigned long max; +}; + /** * struct damon_region - Represents a monitoring target region. * @ar: The address range of the region. @@ -377,6 +387,7 @@ struct damos_filter { struct damon_addr_range addr_range; int target_idx; }; + struct damon_folio_size folio_size; struct list_head list; }; diff --git a/mm/damon/core.c b/mm/damon/core.c index c7b981308862..27323e3a800d 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -776,6 +776,9 @@ static void damos_commit_filter_arg( case DAMOS_FILTER_TYPE_TARGET: dst->target_idx = src->target_idx; break; + case DAMOS_FILTER_TYPE_HUGEPAGE: + dst->folio_size = src->folio_size; + break; default: break; } diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index 98f93ae9f59e..bc7ca43ca9c4 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -316,6 +316,7 @@ struct damon_sysfs_scheme_filter { bool allow; char *memcg_path; struct damon_addr_range addr_range; + struct damon_folio_size folio_size; int target_idx; }; @@ -469,6 +470,43 @@ static ssize_t addr_end_store(struct kobject *kobj, struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); int err = kstrtoul(buf, 0, &filter->addr_range.end); + return err ? err : count; +} + +static ssize_t min_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_scheme_filter *filter = container_of(kobj, + struct damon_sysfs_scheme_filter, kobj); + + return sysfs_emit(buf, "%lu\n", filter->folio_size.min); +} + +static ssize_t min_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_scheme_filter *filter = container_of(kobj, + struct damon_sysfs_scheme_filter, kobj); + int err = kstrtoul(buf, 0, &filter->folio_size.min); + + return err ? err : count; +} + +static ssize_t max_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_scheme_filter *filter = container_of(kobj, + struct damon_sysfs_scheme_filter, kobj); + + return sysfs_emit(buf, "%lu\n", filter->folio_size.max); +} + +static ssize_t max_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_scheme_filter *filter = container_of(kobj, + struct damon_sysfs_scheme_filter, kobj); + int err = kstrtoul(buf, 0, &filter->folio_size.max); return err ? err : count; } @@ -519,6 +557,12 @@ static struct kobj_attribute damon_sysfs_scheme_filter_addr_start_attr = static struct kobj_attribute damon_sysfs_scheme_filter_addr_end_attr = __ATTR_RW_MODE(addr_end, 0600); +static struct kobj_attribute damon_sysfs_scheme_filter_min_attr = + __ATTR_RW_MODE(min, 0600); + +static struct kobj_attribute damon_sysfs_scheme_filter_max_attr = + __ATTR_RW_MODE(max, 0600); + static struct kobj_attribute damon_sysfs_scheme_filter_damon_target_idx_attr = __ATTR_RW_MODE(damon_target_idx, 0600); @@ -529,6 +573,8 @@ static struct attribute *damon_sysfs_scheme_filter_attrs[] = { &damon_sysfs_scheme_filter_memcg_path_attr.attr, &damon_sysfs_scheme_filter_addr_start_attr.attr, &damon_sysfs_scheme_filter_addr_end_attr.attr, + &damon_sysfs_scheme_filter_min_attr.attr, + &damon_sysfs_scheme_filter_max_attr.attr, &damon_sysfs_scheme_filter_damon_target_idx_attr.attr, NULL, }; @@ -1953,6 +1999,13 @@ static int damon_sysfs_add_scheme_filters(struct damos *scheme, filter->addr_range = sysfs_filter->addr_range; } else if (filter->type == DAMOS_FILTER_TYPE_TARGET) { filter->target_idx = sysfs_filter->target_idx; + } else if (filter->type == DAMOS_FILTER_TYPE_HUGEPAGE) { + if (sysfs_filter->folio_size.min > + sysfs_filter->folio_size.max) { + damos_destroy_filter(filter); + return -EINVAL; + } + filter->folio_size = sysfs_filter->folio_size; } damos_add_filter(scheme, filter);
Add min and max files for damon filters to let the userspace decide the min/max folio size to operate on. This will be needed to decide what folio sizes to give pa_stat for. Signed-off-by: Usama Arif <usamaarif642@gmail.com> --- include/linux/damon.h | 11 +++++++++ mm/damon/core.c | 3 +++ mm/damon/sysfs-schemes.c | 53 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 67 insertions(+)