Message ID | 20190927234008.11513-5-leonardo@linux.ibm.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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Fri, 27 Sep 2019 23:40:40 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22036.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x8RNeeg513566566 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 27 Sep 2019 23:40:40 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E9861112062; Fri, 27 Sep 2019 23:40:39 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 473FC112065; Fri, 27 Sep 2019 23:40:36 +0000 (GMT) Received: from LeoBras.aus.stglabs.ibm.com (unknown [9.18.235.58]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Fri, 27 Sep 2019 23:40:36 +0000 (GMT) From: Leonardo Bras <leonardo@linux.ibm.com> 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 Cc: Leonardo Bras <leonardo@linux.ibm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Michael Ellerman <mpe@ellerman.id.au>, Arnd Bergmann <arnd@arndb.de>, "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>, Christophe Leroy <christophe.leroy@c-s.fr>, Andrew Morton <akpm@linux-foundation.org>, Dan Williams <dan.j.williams@intel.com>, Nicholas Piggin <npiggin@gmail.com>, Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>, Allison Randal <allison@lohutok.net>, Thomas Gleixner <tglx@linutronix.de>, Ganesh Goudar <ganeshgr@linux.ibm.com>, Mike Rapoport <rppt@linux.ibm.com>, YueHaibing <yuehaibing@huawei.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Ira Weiny <ira.weiny@intel.com>, Jason Gunthorpe <jgg@ziepe.ca>, John Hubbard <jhubbard@nvidia.com>, Keith Busch <keith.busch@intel.com> Subject: [PATCH v4 04/11] powerpc/mce_power: Applies counting method to monitor lockless pgtbl walks Date: Fri, 27 Sep 2019 20:40:01 -0300 Message-Id: <20190927234008.11513-5-leonardo@linux.ibm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190927234008.11513-1-leonardo@linux.ibm.com> References: <20190927234008.11513-1-leonardo@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-09-27_09:,, 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=720 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1909270205 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: <linux-mm.kvack.org> |
Series |
Introduces new count-based method for monitoring lockless pagetable walks
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diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c index a814d2dfb5b0..0f2f87da4cd1 100644 --- a/arch/powerpc/kernel/mce_power.c +++ b/arch/powerpc/kernel/mce_power.c @@ -27,6 +27,7 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr) { pte_t *ptep; unsigned long flags; + unsigned long pfn; struct mm_struct *mm; if (user_mode(regs)) @@ -34,15 +35,21 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr) else mm = &init_mm; + start_lockless_pgtbl_walk(mm); local_irq_save(flags); if (mm == current->mm) ptep = find_current_mm_pte(mm->pgd, addr, NULL, NULL); else ptep = find_init_mm_pte(addr, NULL); - local_irq_restore(flags); + if (!ptep || pte_special(*ptep)) - return ULONG_MAX; - return pte_pfn(*ptep); + pfn = ULONG_MAX; + else + pfn = pte_pfn(*ptep); + + local_irq_restore(flags); + end_lockless_pgtbl_walk(mm); + return pfn; } /* flush SLBs and reload */
Applies the counting-based method for monitoring lockless pgtable walks on addr_to_pfn(). Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com> --- arch/powerpc/kernel/mce_power.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)