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Date: Sun, 6 Sep 2020 13:43:21 +0200 From: mateusznosek0@...il.com To: linux-mm@...ck.org, linux-kernel@...r.kernel.org Cc: Mateusz Nosek <mateusznosek0@...il.com>, akpm@...ux-foundation.org Subject: [PATCH] mm/mmu_notifier.c: micro-optimization substitute kzalloc with kmalloc From: Mateusz Nosek <mateusznosek0@...il.com> Most fields in struct pointed by 'subscriptions' are initialized explicitly after the allocation. By changing kzalloc to kmalloc the call to memset is avoided. As the only new code consists of 2 simple memory accesses, the performance is increased. Signed-off-by: Mateusz Nosek <mateusznosek0@...il.com> --- mm/mmu_notifier.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index 4fc918163dd3..190e198dc5be 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -625,7 +625,7 @@ int __mmu_notifier_register(struct mmu_notifier *subscription, * know that mm->notifier_subscriptions can't change while we * hold the write side of the mmap_lock. */ - subscriptions = kzalloc( + subscriptions = kmalloc( sizeof(struct mmu_notifier_subscriptions), GFP_KERNEL); if (!subscriptions) return -ENOMEM; @@ -636,6 +636,8 @@ int __mmu_notifier_register(struct mmu_notifier *subscription, subscriptions->itree = RB_ROOT_CACHED; init_waitqueue_head(&subscriptions->wq); INIT_HLIST_HEAD(&subscriptions->deferred_list); + subscriptions->active_invalidate_ranges = 0; + subscriptions->has_itree = false; } ret = mm_take_all_locks(mm); -- 2.20.1
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