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[209.132.183.28]) by mx.google.com with ESMTPS id e18si370296qkg.90.2019.05.10.04.50.38 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 10 May 2019 04:50:38 -0700 (PDT) Received-SPF: pass (google.com: domain of brouer@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of brouer@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=brouer@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 786A030821B5; Fri, 10 May 2019 11:50:37 +0000 (UTC) Received: from carbon (ovpn-200-50.brq.redhat.com [10.40.200.50]) by smtp.corp.redhat.com (Postfix) with ESMTP id 49EA660CD7; Fri, 10 May 2019 11:50:32 +0000 (UTC) Date: Fri, 10 May 2019 13:50:31 +0200 From: Jesper Dangaard Brouer To: David Howells Cc: Christoph Lameter , Andrew Morton , linux-mm , brouer@redhat.com Subject: Re: Bulk kmalloc Message-ID: <20190510135031.1e8908fd@carbon> In-Reply-To: <14647.1557415738@warthog.procyon.org.uk> References: <14647.1557415738@warthog.procyon.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Fri, 10 May 2019 11:50:37 +0000 (UTC) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, 09 May 2019 16:28:58 +0100 David Howells wrote: > Is it possible to use kmem_cache_alloc_bulk() with kmalloc slabs to > effect a bulk kmalloc? Well, we have kfree_bulk() which is a simple wrapper around kmem_cache_free_bulk() (as Christoph make me handle that case). We/I didn't code the kmalloc_bulk() variant. What is you use case? (p.s. fixed the MM-email address) -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer static __always_inline void kfree_bulk(size_t size, void **p) { kmem_cache_free_bulk(NULL, size, p); } Handling code for kfree_bulk case: page = virt_to_head_page(object); if (!s) { /* Handle kalloc'ed objects */ if (unlikely(!PageSlab(page))) { BUG_ON(!PageCompound(page)); kfree_hook(object); __free_pages(page, compound_order(page)); p[size] = NULL; /* mark object processed */ return size; } /* Derive kmem_cache from object */ df->s = page->slab_cache; } else { df->s = cache_from_obj(s, object); /* Support for memcg */ }