| Message ID | 20230724094354.90817-18-zhengqi.arch@bytedance.com |
|---|---|
| State | New |
| Headers | show |
| Series | use refcount+RCU method to implement lockless slab shrink | expand |
> On Jul 24, 2023, at 17:43, Qi Zheng <zhengqi.arch@bytedance.com> wrote: > > Use new APIs to dynamically allocate the rcu-lazy shrinker. > > Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com> > --- > kernel/rcu/tree_nocb.h | 19 +++++++++++-------- > 1 file changed, 11 insertions(+), 8 deletions(-) > > diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h > index 43229d2b0c44..919f17561733 100644 > --- a/kernel/rcu/tree_nocb.h > +++ b/kernel/rcu/tree_nocb.h > @@ -1397,12 +1397,7 @@ lazy_rcu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) > return count ? count : SHRINK_STOP; > } > > -static struct shrinker lazy_rcu_shrinker = { > - .count_objects = lazy_rcu_shrink_count, > - .scan_objects = lazy_rcu_shrink_scan, > - .batch = 0, > - .seeks = DEFAULT_SEEKS, > -}; > +static struct shrinker *lazy_rcu_shrinker; Seems there is no users of this variable, maybe we could drop this.
On 2023/7/26 15:04, Muchun Song wrote: > > >> On Jul 24, 2023, at 17:43, Qi Zheng <zhengqi.arch@bytedance.com> wrote: >> >> Use new APIs to dynamically allocate the rcu-lazy shrinker. >> >> Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com> >> --- >> kernel/rcu/tree_nocb.h | 19 +++++++++++-------- >> 1 file changed, 11 insertions(+), 8 deletions(-) >> >> diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h >> index 43229d2b0c44..919f17561733 100644 >> --- a/kernel/rcu/tree_nocb.h >> +++ b/kernel/rcu/tree_nocb.h >> @@ -1397,12 +1397,7 @@ lazy_rcu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) >> return count ? count : SHRINK_STOP; >> } >> >> -static struct shrinker lazy_rcu_shrinker = { >> - .count_objects = lazy_rcu_shrink_count, >> - .scan_objects = lazy_rcu_shrink_scan, >> - .batch = 0, >> - .seeks = DEFAULT_SEEKS, >> -}; >> +static struct shrinker *lazy_rcu_shrinker; > > Seems there is no users of this variable, maybe we could drop > this. Yeah, will change it to a local variable. And the patch #15 is the same. >
diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h index 43229d2b0c44..919f17561733 100644 --- a/kernel/rcu/tree_nocb.h +++ b/kernel/rcu/tree_nocb.h @@ -1397,12 +1397,7 @@ lazy_rcu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) return count ? count : SHRINK_STOP; } -static struct shrinker lazy_rcu_shrinker = { - .count_objects = lazy_rcu_shrink_count, - .scan_objects = lazy_rcu_shrink_scan, - .batch = 0, - .seeks = DEFAULT_SEEKS, -}; +static struct shrinker *lazy_rcu_shrinker; #endif // #ifdef CONFIG_RCU_LAZY void __init rcu_init_nohz(void) @@ -1436,8 +1431,16 @@ void __init rcu_init_nohz(void) return; #ifdef CONFIG_RCU_LAZY - if (register_shrinker(&lazy_rcu_shrinker, "rcu-lazy")) - pr_err("Failed to register lazy_rcu shrinker!\n"); + lazy_rcu_shrinker = shrinker_alloc(0, "rcu-lazy"); + if (!lazy_rcu_shrinker) { + pr_err("Failed to allocate lazy_rcu shrinker!\n"); + } else { + lazy_rcu_shrinker->count_objects = lazy_rcu_shrink_count; + lazy_rcu_shrinker->scan_objects = lazy_rcu_shrink_scan; + lazy_rcu_shrinker->seeks = DEFAULT_SEEKS; + + shrinker_register(lazy_rcu_shrinker); + } #endif // #ifdef CONFIG_RCU_LAZY if (!cpumask_subset(rcu_nocb_mask, cpu_possible_mask)) {
Use new APIs to dynamically allocate the rcu-lazy shrinker. Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com> --- kernel/rcu/tree_nocb.h | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-)