From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC810C433ED for ; Wed, 21 Apr 2021 17:39:55 +0000 (UTC) Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 760A861430 for ; Wed, 21 Apr 2021 17:39:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 760A861430 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvdimm-bounces@lists.01.org Received: from ml01.vlan13.01.org (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 30944100EAB62; Wed, 21 Apr 2021 10:39:55 -0700 (PDT) Received-SPF: Pass (mailfrom) identity=mailfrom; client-ip=170.10.133.124; helo=us-smtp-delivery-124.mimecast.com; envelope-from=vgoyal@redhat.com; receiver= Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 2839C100EAB60 for ; Wed, 21 Apr 2021 10:39:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1619026790; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=NozKqtAQsLfIuTJYfL4jEF5T8uHtk7yVgiyg7jRNbZo=; b=bQUnKTyfhm9VaeDMKQYSZ+PTqHRIi0Qjfd9oCzk6oe1GzP8SvADgnARwIGcAeGcvOJx36O Wwul+raFs7oxCiR5lgj17bZNN7X8rcMhMJkSRWT+L2pZSGnQIiY8jPfhJulxfVoUKRcWFS ZGLONLx857YhTryTfsRPvohL+LpfmmY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-438-R1oJopAjPNS_ZDvua3z3Zg-1; Wed, 21 Apr 2021 13:39:36 -0400 X-MC-Unique: R1oJopAjPNS_ZDvua3z3Zg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8EAE28030C9; Wed, 21 Apr 2021 17:39:35 +0000 (UTC) Received: from horse.redhat.com (ovpn-114-206.rdu2.redhat.com [10.10.114.206]) by smtp.corp.redhat.com (Postfix) with ESMTP id 26E885D769; Wed, 21 Apr 2021 17:39:32 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id B4E70220BCF; Wed, 21 Apr 2021 13:39:31 -0400 (EDT) Date: Wed, 21 Apr 2021 13:39:31 -0400 From: Vivek Goyal To: Greg Kurz Subject: Re: [Virtio-fs] [PATCH v3 2/3] dax: Add a wakeup mode parameter to put_unlocked_entry() Message-ID: <20210421173931.GF1579961@redhat.com> References: <20210419213636.1514816-1-vgoyal@redhat.com> <20210419213636.1514816-3-vgoyal@redhat.com> <20210420093420.2eed3939@bahia.lan> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210420093420.2eed3939@bahia.lan> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Message-ID-Hash: KA74JVOM7ONVQKQDFROP4FS32K65QQFG X-Message-ID-Hash: KA74JVOM7ONVQKQDFROP4FS32K65QQFG X-MailFrom: vgoyal@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; suspicious-header CC: linux-fsdevel@vger.kernel.org, jack@suse.cz, willy@infradead.org, linux-nvdimm@lists.01.org, miklos@szeredi.hu, linux-kernel@vger.kernel.org, virtio-fs@redhat.com X-Mailman-Version: 3.1.1 Precedence: list List-Id: "Linux-nvdimm developer list." Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Tue, Apr 20, 2021 at 09:34:20AM +0200, Greg Kurz wrote: > On Mon, 19 Apr 2021 17:36:35 -0400 > Vivek Goyal wrote: > > > As of now put_unlocked_entry() always wakes up next waiter. In next > > patches we want to wake up all waiters at one callsite. Hence, add a > > parameter to the function. > > > > This patch does not introduce any change of behavior. > > > > Suggested-by: Dan Williams > > Signed-off-by: Vivek Goyal > > --- > > fs/dax.c | 13 +++++++------ > > 1 file changed, 7 insertions(+), 6 deletions(-) > > > > diff --git a/fs/dax.c b/fs/dax.c > > index 00978d0838b1..f19d76a6a493 100644 > > --- a/fs/dax.c > > +++ b/fs/dax.c > > @@ -275,11 +275,12 @@ static void wait_entry_unlocked(struct xa_state *xas, void *entry) > > finish_wait(wq, &ewait.wait); > > } > > > > -static void put_unlocked_entry(struct xa_state *xas, void *entry) > > +static void put_unlocked_entry(struct xa_state *xas, void *entry, > > + enum dax_entry_wake_mode mode) > > { > > /* If we were the only waiter woken, wake the next one */ > > With this change, the comment is no longer accurate since the > function can now wake all waiters if passed mode == WAKE_ALL. > Also, it paraphrases the code which is simple enough, so I'd > simply drop it. Ok, I will get rid of this comment. Agreed that code is simple enough. And frankly speaking I don't even understand "If we were the only waiter woken" part. How do we know that only this caller was woken. Vivek > > This is minor though and it shouldn't prevent this fix to go > forward. > > Reviewed-by: Greg Kurz > > > if (entry && !dax_is_conflict(entry)) > > - dax_wake_entry(xas, entry, WAKE_NEXT); > > + dax_wake_entry(xas, entry, mode); > > } > > > > /* > > @@ -633,7 +634,7 @@ struct page *dax_layout_busy_page_range(struct address_space *mapping, > > entry = get_unlocked_entry(&xas, 0); > > if (entry) > > page = dax_busy_page(entry); > > - put_unlocked_entry(&xas, entry); > > + put_unlocked_entry(&xas, entry, WAKE_NEXT); > > if (page) > > break; > > if (++scanned % XA_CHECK_SCHED) > > @@ -675,7 +676,7 @@ static int __dax_invalidate_entry(struct address_space *mapping, > > mapping->nrexceptional--; > > ret = 1; > > out: > > - put_unlocked_entry(&xas, entry); > > + put_unlocked_entry(&xas, entry, WAKE_NEXT); > > xas_unlock_irq(&xas); > > return ret; > > } > > @@ -954,7 +955,7 @@ static int dax_writeback_one(struct xa_state *xas, struct dax_device *dax_dev, > > return ret; > > > > put_unlocked: > > - put_unlocked_entry(xas, entry); > > + put_unlocked_entry(xas, entry, WAKE_NEXT); > > return ret; > > } > > > > @@ -1695,7 +1696,7 @@ dax_insert_pfn_mkwrite(struct vm_fault *vmf, pfn_t pfn, unsigned int order) > > /* Did we race with someone splitting entry or so? */ > > if (!entry || dax_is_conflict(entry) || > > (order == 0 && !dax_is_pte_entry(entry))) { > > - put_unlocked_entry(&xas, entry); > > + put_unlocked_entry(&xas, entry, WAKE_NEXT); > > xas_unlock_irq(&xas); > > trace_dax_insert_pfn_mkwrite_no_entry(mapping->host, vmf, > > VM_FAULT_NOPAGE); > _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org