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Thu, 03 Oct 2019 01:34:57 +0000 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp08027.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x931Ytc151708192 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 3 Oct 2019 01:34:55 GMT Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A2BFF7805E; Thu, 3 Oct 2019 01:34:55 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A72B37805C; Thu, 3 Oct 2019 01:34:42 +0000 (GMT) Received: from LeoBras.ibmuc.com (unknown [9.85.174.224]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Thu, 3 Oct 2019 01:34:42 +0000 (GMT) From: Leonardo Bras To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v5 05/11] powerpc/perf: Applies counting method to monitor lockless pgtbl walks Date: Wed, 2 Oct 2019 22:33:19 -0300 Message-Id: <20191003013325.2614-6-leonardo@linux.ibm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191003013325.2614-1-leonardo@linux.ibm.com> References: <20191003013325.2614-1-leonardo@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-10-03_01:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=881 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910030012 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Song Liu , Michal Hocko , "Peter Zijlstra \(Intel\)" , "Dmitry V. Levin" , Keith Busch , Paul Mackerras , Christoph Lameter , Ira Weiny , Thomas Gleixner , Elena Reshetova , Andrea Arcangeli , Santosh Sivaraj , Davidlohr Bueso , "Aneesh Kumar K.V" , Bartlomiej Zolnierkiewicz , Mike Rapoport , Jason Gunthorpe , Allison Randal , Mahesh Salgaonkar , Leonardo Bras , Alexey Dobriyan , Ingo Molnar , Ralph Campbell , Arnd Bergmann , Jann Horn , John Hubbard , Jesper Dangaard Brouer , Nicholas Piggin , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Mathieu Desnoyers , Al Viro , Andrey Ryabinin , Dan Williams , Reza Arbab , Vlastimil Babka , Christian Brauner , Greg Kroah-Hartman , Souptick Joarder , Andrew Morton , Logan Gunthorpe , Roman Gushchin , "Kirill A. Shutemov" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Applies the counting-based method for monitoring lockless pgtable walks on read_user_stack_slow. local_irq_{save,restore} is already inside {begin,end}_lockless_pgtbl_walk, so there is no need to repeat it here. Variable that saves the irq mask was renamed from flags to irq_mask so it doesn't lose meaning now it's not directly passed to local_irq_* functions. Signed-off-by: Leonardo Bras --- arch/powerpc/perf/callchain.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c index c84bbd4298a0..43e49d8be344 100644 --- a/arch/powerpc/perf/callchain.c +++ b/arch/powerpc/perf/callchain.c @@ -116,14 +116,14 @@ static int read_user_stack_slow(void __user *ptr, void *buf, int nb) unsigned shift; unsigned long addr = (unsigned long) ptr; unsigned long offset; - unsigned long pfn, flags; + unsigned long pfn, irq_mask; void *kaddr; pgdir = current->mm->pgd; if (!pgdir) return -EFAULT; - local_irq_save(flags); + irq_mask = begin_lockless_pgtbl_walk(current->mm); ptep = find_current_mm_pte(pgdir, addr, NULL, &shift); if (!ptep) goto err_out; @@ -145,7 +145,7 @@ static int read_user_stack_slow(void __user *ptr, void *buf, int nb) memcpy(buf, kaddr + offset, nb); ret = 0; err_out: - local_irq_restore(flags); + end_lockless_pgtbl_walk(current->mm, irq_mask); return ret; } -- 2.20.1