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: "Song Liu" <songliubraving@fb.com>,
"Michal Hocko" <mhocko@suse.com>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
"Dmitry V. Levin" <ldv@altlinux.org>,
"Keith Busch" <keith.busch@intel.com>,
"Paul Mackerras" <paulus@samba.org>,
"Christoph Lameter" <cl@linux.com>,
"Ira Weiny" <ira.weiny@intel.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Elena Reshetova" <elena.reshetova@intel.com>,
"Andrea Arcangeli" <aarcange@redhat.com>,
"Santosh Sivaraj" <santosh@fossix.org>,
"Davidlohr Bueso" <dave@stgolabs.net>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
"Bartlomiej Zolnierkiewicz" <b.zolnierkie@samsung.com>,
"Mike Rapoport" <rppt@linux.ibm.com>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
"Allison Randal" <allison@lohutok.net>,
"Mahesh Salgaonkar" <mahesh@linux.vnet.ibm.com>,
"Leonardo Bras" <leonardo@linux.ibm.com>,
"Alexey Dobriyan" <adobriyan@gmail.com>,
"Ingo Molnar" <mingo@kernel.org>,
"Ralph Campbell" <rcampbell@nvidia.com>,
"Arnd Bergmann" <arnd@arndb.de>, "Jann Horn" <jannh@google.com>,
"John Hubbard" <jhubbard@nvidia.com>,
"Jesper Dangaard Brouer" <brouer@redhat.com>,
"Nicholas Piggin" <npiggin@gmail.com>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Al Viro" <viro@zeniv.linux.org.uk>,
"Andrey Ryabinin" <aryabinin@virtuozzo.com>,
"Dan Williams" <dan.j.williams@intel.com>,
"Reza Arbab" <arbab@linux.ibm.com>,
"Vlastimil Babka" <vbabka@suse.cz>,
"Christian Brauner" <christian.brauner@ubuntu.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Souptick Joarder" <jrdr.linux@gmail.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Logan Gunthorpe" <logang@deltatee.com>,
"Roman Gushchin" <guro@fb.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCH v5 05/11] powerpc/perf: Applies counting method to monitor lockless pgtbl walks
Date: Wed, 2 Oct 2019 22:33:19 -0300 [thread overview]
Message-ID: <20191003013325.2614-6-leonardo@linux.ibm.com> (raw)
In-Reply-To: <20191003013325.2614-1-leonardo@linux.ibm.com>
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 <leonardo@linux.ibm.com>
---
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
next prev parent reply other threads:[~2019-10-03 1:58 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-03 1:33 [PATCH v5 00/11] Introduces new count-based method for tracking lockless pagetable walks Leonardo Bras
2019-10-03 1:33 ` [PATCH v5 01/11] asm-generic/pgtable: Adds generic functions to monitor lockless pgtable walks Leonardo Bras
2019-10-03 7:11 ` Peter Zijlstra
2019-10-03 11:51 ` Peter Zijlstra
2019-10-03 20:40 ` John Hubbard
2019-10-04 11:24 ` Peter Zijlstra
2019-10-03 21:24 ` Leonardo Bras
2019-10-04 11:28 ` Peter Zijlstra
2019-10-09 18:09 ` Leonardo Bras
2019-10-05 8:35 ` Aneesh Kumar K.V
2019-10-08 14:47 ` Kirill A. Shutemov
2019-10-03 1:33 ` [PATCH v5 02/11] powerpc/mm: Adds counting method " Leonardo Bras
2019-10-08 15:11 ` Christopher Lameter
2019-10-08 17:13 ` Leonardo Bras
2019-10-08 17:43 ` Christopher Lameter
2019-10-08 18:02 ` Leonardo Bras
2019-10-08 18:27 ` Christopher Lameter
2019-10-03 1:33 ` [PATCH v5 03/11] mm/gup: Applies counting method to monitor gup_pgd_range Leonardo Bras
2019-10-03 1:33 ` [PATCH v5 04/11] powerpc/mce_power: Applies counting method to monitor lockless pgtbl walks Leonardo Bras
2019-10-03 1:33 ` Leonardo Bras [this message]
2019-10-03 1:33 ` [PATCH v5 06/11] powerpc/mm/book3s64/hash: " Leonardo Bras
2019-10-03 1:33 ` [PATCH v5 07/11] powerpc/kvm/e500: " Leonardo Bras
2019-10-03 1:33 ` [PATCH v5 08/11] powerpc/kvm/book3s_hv: " Leonardo Bras
2019-10-03 1:33 ` [PATCH v5 09/11] powerpc/kvm/book3s_64: " Leonardo Bras
2019-10-03 1:33 ` [PATCH v5 10/11] mm/Kconfig: Adds config option to track lockless pagetable walks Leonardo Bras
2019-10-03 2:08 ` Qian Cai
2019-10-03 19:04 ` Leonardo Bras
2019-10-03 19:08 ` Leonardo Bras
2019-10-03 7:44 ` Peter Zijlstra
2019-10-03 20:40 ` Leonardo Bras
2019-10-03 1:33 ` [PATCH v5 11/11] powerpc/mm/book3s64/pgtable: Uses counting method to skip serializing Leonardo Bras
2019-10-03 7:29 ` [PATCH v5 00/11] Introduces new count-based method for tracking lockless pagetable walks Peter Zijlstra
2019-10-03 20:36 ` Leonardo Bras
2019-10-03 20:49 ` John Hubbard
2019-10-03 21:38 ` Leonardo Bras
2019-10-04 11:42 ` Peter Zijlstra
2019-10-04 12:57 ` Peter Zijlstra
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