Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755180AbaAHARQ (ORCPT ); Tue, 7 Jan 2014 19:17:16 -0500 Received: from smtp02.citrix.com ([66.165.176.63]:15749 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754795AbaAHAPS (ORCPT ); Tue, 7 Jan 2014 19:15:18 -0500 X-IronPort-AV: E=Sophos;i="4.95,621,1384300800"; d="scan'208";a="88543860" From: Zoltan Kiss To: , , , , , CC: Zoltan Kiss Subject: [PATCH net-next v3 5/9] xen-netback: Add stat counters for zerocopy Date: Wed, 8 Jan 2014 00:10:14 +0000 Message-ID: <1389139818-24458-6-git-send-email-zoltan.kiss@citrix.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1389139818-24458-1-git-send-email-zoltan.kiss@citrix.com> References: <1389139818-24458-1-git-send-email-zoltan.kiss@citrix.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.80.2.133] X-DLP: MIA2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org These counters help determine how often the buffers had to be copied. Also they help find out if packets are leaked, as if "sent != success + fail", there are probably packets never freed up properly. Signed-off-by: Zoltan Kiss --- drivers/net/xen-netback/common.h | 3 +++ drivers/net/xen-netback/interface.c | 15 +++++++++++++++ drivers/net/xen-netback/netback.c | 9 ++++++++- 3 files changed, 26 insertions(+), 1 deletion(-) diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h index 419e63c..e3c28ff 100644 --- a/drivers/net/xen-netback/common.h +++ b/drivers/net/xen-netback/common.h @@ -155,6 +155,9 @@ struct xenvif { /* Statistics */ unsigned long rx_gso_checksum_fixup; + unsigned long tx_zerocopy_sent; + unsigned long tx_zerocopy_success; + unsigned long tx_zerocopy_fail; /* Miscellaneous private stuff. */ struct net_device *dev; diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c index af5216f..75fe683 100644 --- a/drivers/net/xen-netback/interface.c +++ b/drivers/net/xen-netback/interface.c @@ -239,6 +239,21 @@ static const struct xenvif_stat { "rx_gso_checksum_fixup", offsetof(struct xenvif, rx_gso_checksum_fixup) }, + /* If (sent != success + fail), there are probably packets never + * freed up properly! + */ + { + "tx_zerocopy_sent", + offsetof(struct xenvif, tx_zerocopy_sent), + }, + { + "tx_zerocopy_success", + offsetof(struct xenvif, tx_zerocopy_success), + }, + { + "tx_zerocopy_fail", + offsetof(struct xenvif, tx_zerocopy_fail) + }, }; static int xenvif_get_sset_count(struct net_device *dev, int string_set) diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index a1b03e4..e2dd565 100644 --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -1611,8 +1611,10 @@ static int xenvif_tx_submit(struct xenvif *vif, int budget) * skb_copy_ubufs while we are still in control of the skb. E.g. * the __pskb_pull_tail earlier can do such thing. */ - if (skb_shinfo(skb)->destructor_arg) + if (skb_shinfo(skb)->destructor_arg) { skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; + vif->tx_zerocopy_sent++; + } netif_receive_skb(skb); } @@ -1645,6 +1647,11 @@ void xenvif_zerocopy_callback(struct ubuf_info *ubuf, bool zerocopy_success) napi_schedule(&vif->napi); } while (ubuf); spin_unlock_irqrestore(&vif->dealloc_lock, flags); + + if (likely(zerocopy_success)) + vif->tx_zerocopy_success++; + else + vif->tx_zerocopy_fail++; } static inline void xenvif_tx_action_dealloc(struct xenvif *vif) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/