From owner-freebsd-hackers@freebsd.org Sat Aug 31 20:34:03 2019 Return-Path: Delivered-To: freebsd-hackers@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 2DEE8DB354; Sat, 31 Aug 2019 20:34:03 +0000 (UTC) (envelope-from shreyankfbsd@gmail.com) Received: from mail-yb1-xb36.google.com (mail-yb1-xb36.google.com [IPv6:2607:f8b0:4864:20::b36]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 46LSk21KCwz3N0K; Sat, 31 Aug 2019 20:34:01 +0000 (UTC) (envelope-from shreyankfbsd@gmail.com) Received: by mail-yb1-xb36.google.com with SMTP id t15so3698562ybg.7; Sat, 31 Aug 2019 13:34:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to:cc; bh=d1frEj6sgThf89efHLok+CyF24QjJzhPZrryN/OCMTs=; b=k1FhwzuNAwUnkFPLoLubXymbNOfczAUlNUTDV0i3Y6vwCxJI/GNgWiIBT05B7Bhud9 F9dpG5kkdrbBvsU9U7VI0+wyjjYA6cmzvLWd8qECXkyeEjsO2IEIFRRlde6y1u/vVuzt CT8BVKT1nuv+InFq0tgQ3yqTX92JTfIGVZlRicbnu7lwo7Y/u0zye9UkKwPvCXYQsQn9 XlB8+Z7YqC6etLr3JV/bixFK1xeCOaXAT9NnRbUOGVmOev0v6GBf9IQEBPaiX3/jn8pK wY7Jtg1KIAb6Qsqfj7UbLjKL4PqEWXA/iEjuSGqSzNbJrlTRPve3FLqRU16xHzL4r0oy ygOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=d1frEj6sgThf89efHLok+CyF24QjJzhPZrryN/OCMTs=; b=g4zTOmIolkSqztBf7I/P4JEuln11GhvRF4p44ezDtHajxsdZkfw5m4ctt1ATXtVqmt BLAoq63ghkhR/JJmCaqqm7dHqHmVvA/74GHFwvduyltZchIrZntp1bPYVeFvrc7D2OZr zKbh4rMVs/2FUnhWPE4g/rcafrtCq6oARJZXaleaPmiIDnBE1b13Dutn6FU9nHCZAoKe 7VZC8Nrde/3Ieic6yg0YEFBKsxET4VvDdC5uNCsR4vR8040FJWT2thqHQwbt7lZgMCaz +y/JInkixo0bAI7r24MNN+adGznS1tdVo4QPsIqVs0mbolHV/zkOEXQC9gUS3aj/bD4g 7WYg== X-Gm-Message-State: APjAAAWER6BKCZvdj+HWl0wt0AKCk1yitc84aXD3+p7o8yCna3e+1pLg 0WGt2CKw9JbRv1MAYQA80DQHvR4cDJ2G8dqPT0Y9Fdw= X-Google-Smtp-Source: APXvYqwL6IFML+zrjdQK7IW/RZE/02MGaVUY6QvWbPQ82UI2M9x1+vtoEvNL6jh1LcwaG+pUDAaOEKhWjnau6GIpZkc= X-Received: by 2002:a25:5ca:: with SMTP id 193mr16383919ybf.388.1567283640294; Sat, 31 Aug 2019 13:34:00 -0700 (PDT) MIME-Version: 1.0 From: shreyank amartya Date: Sun, 1 Sep 2019 02:03:48 +0530 Message-ID: Subject: hwpmc NMI/cpuxx ... going to debugger To: freebsd-drivers@freebsd.org Cc: freebsd-hackers@freebsd.org, avg@freebsd.org, mmacy@freebsd.org X-Rspamd-Queue-Id: 46LSk21KCwz3N0K X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=k1FhwzuN; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of shreyankfbsd@gmail.com designates 2607:f8b0:4864:20::b36 as permitted sender) smtp.mailfrom=shreyankfbsd@gmail.com X-Spamd-Result: default: False [-3.99 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; FREEMAIL_FROM(0.00)[gmail.com]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; TO_DN_NONE(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; IP_SCORE_FREEMAIL(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; IP_SCORE(0.00)[ip: (-9.45), ipnet: 2607:f8b0::/32(-2.83), asn: 15169(-2.31), country: US(-0.05)]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RCVD_IN_DNSWL_NONE(0.00)[6.3.b.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; NEURAL_HAM_SHORT(-0.99)[-0.994,0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0] Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 31 Aug 2019 20:34:03 -0000 Hi, I'm trying to profile a java application using hwpmc. While running the profiler I run into these errors: NMI ISA 30, EISA ff NMI/cpu123 ... going to debugger NMI ISA 30, EISA ff NMI/cpu58 ... going to debugger NMI ISA 20, EISA ff NMI/cpu59 ... going to debugger Due to this, pmclog contains very few samples and sometimes none at all. I enabled hwpmc kernel traces and with that it seems that cpu which is unable to catch the pmc interrupt hits true for this condition in amd_intr(hwpmc_amd.c): if ((pm = pac->pc_amdpmcs[i].phw_pmc) == NULL || !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) { isnull++; continue; } if (!AMD_PMC_HAS_OVERFLOWED(i)) { ovrflw++; continue; } These are some logs Aug 31 20:01:11 amd kernel: cpu245 MDP:INT:1: cpu=245 tf=0xfffffe00015cbf30 um=0 Aug 31 20:01:11 amd kernel: cpu245 MDP:INT:2: retval=1 isnull=0 ovrflw=0 Aug 31 20:01:11 amd kernel: cpu245 MDP:INT:1: cpu=245 tf=0xfffffe00015cbf30 um=1 Aug 31 20:01:11 amd kernel: cpu245 MDP:INT:2: retval=1 isnull=0 ovrflw=0 Aug 31 20:01:11 amd kernel: cpu245 MDP:INT:1: cpu=245 tf=0xfffffe00015cbf30 um=0 Aug 31 20:01:11 amd kernel: cpu245 MDP:INT:2: retval=0 isnull=16 ovrflw=0 Aug 31 20:01:11 amd kernel: NMI ISA 3c, EISA ff Aug 31 20:01:11 amd kernel: NMI/cpu245 ... going to debugger Aug 31 20:01:11 amd kernel: cpu236 MDP:INT:1: cpu=236 tf=0xfffffe0001595f30 um=0 Aug 31 20:01:11 amd kernel: cpu236 MDP:INT:2: retval=1 isnull=0 ovrflw=0 Aug 31 20:01:11 amd kernel: cpu252 MDP:INT:1: cpu=252 tf=0xfffffe00015f5f30 um=0 Aug 31 20:01:11 amd kernel: cpu252 MDP:INT:2: retval=1 isnull=0 ovrflw=0 Other observations: If I enable all the md=* flags, I do not see this issue. When i run the profiler for a C++ application, I do not encounter this problem. There is no panic observed. Any idea on what could be causing this? or pointers on how to debug this further? Thanks Shreyank