From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it1-f196.google.com ([209.85.166.196]:38816 "EHLO mail-it1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727089AbeLAEHB (ORCPT ); Fri, 30 Nov 2018 23:07:01 -0500 Received: by mail-it1-f196.google.com with SMTP id h65so10226089ith.3 for ; Fri, 30 Nov 2018 08:57:06 -0800 (PST) From: Jens Axboe To: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org Cc: hch@lst.de, Jens Axboe Subject: [PATCH 10/27] aio: don't zero entire aio_kiocb aio_get_req() Date: Fri, 30 Nov 2018 09:56:29 -0700 Message-Id: <20181130165646.27341-11-axboe@kernel.dk> In-Reply-To: <20181130165646.27341-1-axboe@kernel.dk> References: <20181130165646.27341-1-axboe@kernel.dk> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: It's 192 bytes, fairly substantial. Most items don't need to be cleared, especially not upfront. Clear the ones we do need to clear, and leave the other ones for setup when the iocb is prepared and submitted. Signed-off-by: Jens Axboe --- fs/aio.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/fs/aio.c b/fs/aio.c index eaceb40e6cf5..681f2072f81b 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -1009,14 +1009,15 @@ static inline struct aio_kiocb *aio_get_req(struct kioctx *ctx) { struct aio_kiocb *req; - req = kmem_cache_alloc(kiocb_cachep, GFP_KERNEL|__GFP_ZERO); - if (unlikely(!req)) - return NULL; + req = kmem_cache_alloc(kiocb_cachep, GFP_KERNEL); + if (req) { + percpu_ref_get(&ctx->reqs); + req->ki_ctx = ctx; + INIT_LIST_HEAD(&req->ki_list); + refcount_set(&req->ki_refcnt, 0); + req->ki_eventfd = NULL; + } - percpu_ref_get(&ctx->reqs); - INIT_LIST_HEAD(&req->ki_list); - refcount_set(&req->ki_refcnt, 0); - req->ki_ctx = ctx; return req; } @@ -1730,6 +1731,10 @@ static ssize_t aio_poll(struct aio_kiocb *aiocb, struct iocb *iocb) if (unlikely(!req->file)) return -EBADF; + req->head = NULL; + req->woken = false; + req->cancelled = false; + apt.pt._qproc = aio_poll_queue_proc; apt.pt._key = req->events; apt.iocb = aiocb; -- 2.17.1