From patchwork Wed May 4 18:48:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ali Saidi X-Patchwork-Id: 12838398 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 44D32C433F5 for ; Wed, 4 May 2022 18:50:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ljbR1fqRHWIhv+buPjz5bw4waIRaEOZhTFu1q8I57TY=; b=dUmTKu1bqwlrrq sTHwpk64iss1uJzJ2SUHfFNDhNQQNF2XeLxhqwCWFHCTgwIhvUwno8REgW6d9MG3n/EfPowqelN3d f+zQ9CrqEBVnCQREc4JDKGvWjiGRElJLTh5MUKn62TKrZJckMyugNKTSdDq8Xq4ZV1SMJByNeU79I aX+nb6dWvVO1GcwnI9NPxkvtHhwYgKhq2z9rn0A3GomNNc/sPCLHKRMxX1N83WblMLFQg/CpRJ1Wr AVSLN4kE5rA7RTJtnsZIO431KOQzusjnCM0neWG20X9YrSRd+aZNbarli50+4hkAZmicXq1Tmzwrn 4SaZWKxnRaONpItEdPFg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nmK4B-00CCyp-Aq; Wed, 04 May 2022 18:49:39 +0000 Received: from smtp-fw-6002.amazon.com ([52.95.49.90]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nmK3i-00CCnA-R1 for linux-arm-kernel@lists.infradead.org; Wed, 04 May 2022 18:49:12 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1651690151; x=1683226151; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=2kGoDhwDDU4SUv0yonPrLgPdKoDB23uSHWFWBT2qSyo=; b=neYsWIVc9H1X9JujwkMHWfMJJYQ0k2PastVvSPvy5VekKcLVqNA2S7yd xC/qGLUpUhrTFP5IhbobbqPA9P8Bt+nDnQYYRo3uUNgJvbJHP/3ZXeutj 4jYhQYcY0uGapHOBrmG1NHXqw7JC+LcnyxTlfSdxIEBft1dEwinjdtCV5 8=; X-IronPort-AV: E=Sophos;i="5.91,198,1647302400"; d="scan'208";a="198648650" Received: from iad12-co-svc-p1-lb1-vlan2.amazon.com (HELO email-inbound-relay-iad-1e-90d70b14.us-east-1.amazon.com) ([10.43.8.2]) by smtp-border-fw-6002.iad6.amazon.com with ESMTP; 04 May 2022 18:49:10 +0000 Received: from EX13MTAUWB001.ant.amazon.com (iad12-ws-svc-p26-lb9-vlan3.iad.amazon.com [10.40.163.38]) by email-inbound-relay-iad-1e-90d70b14.us-east-1.amazon.com (Postfix) with ESMTPS id 70258C0428; Wed, 4 May 2022 18:49:04 +0000 (UTC) Received: from EX13D02UWC002.ant.amazon.com (10.43.162.6) by EX13MTAUWB001.ant.amazon.com (10.43.161.207) with Microsoft SMTP Server (TLS) id 15.0.1497.32; Wed, 4 May 2022 18:48:59 +0000 Received: from EX13MTAUEE002.ant.amazon.com (10.43.62.24) by EX13D02UWC002.ant.amazon.com (10.43.162.6) with Microsoft SMTP Server (TLS) id 15.0.1497.32; Wed, 4 May 2022 18:48:59 +0000 Received: from dev-dsk-alisaidi-1d-b9a0e636.us-east-1.amazon.com (172.19.181.128) by mail-relay.amazon.com (10.43.62.224) with Microsoft SMTP Server id 15.0.1497.32 via Frontend Transport; Wed, 4 May 2022 18:48:58 +0000 Received: by dev-dsk-alisaidi-1d-b9a0e636.us-east-1.amazon.com (Postfix, from userid 5131138) id 7754C20BB; Wed, 4 May 2022 18:48:57 +0000 (UTC) From: Ali Saidi To: , , , , , CC: , , , , , , , , , , , , , , , Subject: [PATCH v8 1/5] perf: Add SNOOP_PEER flag to perf mem data struct Date: Wed, 4 May 2022 18:48:46 +0000 Message-ID: <20220504184850.24986-2-alisaidi@amazon.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220504184850.24986-1-alisaidi@amazon.com> References: <20220504184850.24986-1-alisaidi@amazon.com> MIME-Version: 1.0 Precedence: Bulk X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220504_114911_020320_C2DABAD2 X-CRM114-Status: GOOD ( 14.33 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a flag to the perf mem data struct to signal that a request caused a cache-to-cache transfer of a line from a peer of the requestor and wasn't sourced from a lower cache level. The line being moved from one peer cache to another has latency and performance implications. On Arm64 Neoverse systems the data source can indicate a cache-to-cache transfer but not if the line is dirty or clean, so instead of overloading HITM define a new flag that indicates this type of transfer. Signed-off-by: Ali Saidi Reviewed-by: Leo Yan Reviewed-By: Kajol Jain --- include/uapi/linux/perf_event.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index d37629dbad72..7b88bfd097dc 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -1310,7 +1310,7 @@ union perf_mem_data_src { #define PERF_MEM_SNOOP_SHIFT 19 #define PERF_MEM_SNOOPX_FWD 0x01 /* forward */ -/* 1 free */ +#define PERF_MEM_SNOOPX_PEER 0x02 /* xfer from peer */ #define PERF_MEM_SNOOPX_SHIFT 38 /* locked instruction */