Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
MIME-Version: 1.0
References: <20220915150417.722975-19-glider@google.com> <20221019173620.10167-1-youling257@gmail.com>
 <CAOzgRda_CToTVicwxx86E7YcuhDTcayJR=iQtWQ3jECLLhHzcg@mail.gmail.com>
 <CANpmjNMPKokoJVFr9==-0-+O1ypXmaZnQT3hs4Ys0Y4+o86OVA@mail.gmail.com>
 <CAOzgRdbbVWTWR0r4y8u5nLUeANA7bU-o5JxGCHQ3r7Ht+TCg1Q@mail.gmail.com>
 <Y1BXQlu+JOoJi6Yk@elver.google.com> <CAOzgRdY6KSxDMRJ+q2BWHs4hRQc5y-PZ2NYG++-AMcUrO8YOgA@mail.gmail.com>
 <Y1Bt+Ia93mVV/lT3@elver.google.com> <CAG_fn=WLRN=C1rKrpq4=d=AO9dBaGxoa6YsG7+KrqAck5Bty0Q@mail.gmail.com>
 <CAOzgRdb+W3_FuOB+P_HkeinDiJdgpQSsXMC4GArOSixL9K5avg@mail.gmail.com>
In-Reply-To: <CAOzgRdb+W3_FuOB+P_HkeinDiJdgpQSsXMC4GArOSixL9K5avg@mail.gmail.com>
From:   Marco Elver <elver@google.com>
Date:   Thu, 20 Oct 2022 23:16:47 -0700
Message-ID: <CANpmjNMUCsRm9qmi5eydHUHP2f5Y+Bt_thA97j8ZrEa5PN3sQg@mail.gmail.com>
Subject: Re: [PATCH v7 18/43] instrumented.h: add KMSAN support
To:     youling 257 <youling257@gmail.com>
Cc:     Alexander Potapenko <glider@google.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Alexei Starovoitov <ast@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andrey Konovalov <andreyknvl@google.com>,
        Andy Lutomirski <luto@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>,
        Christoph Hellwig <hch@lst.de>,
        Christoph Lameter <cl@linux.com>,
        David Rientjes <rientjes@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Eric Biggers <ebiggers@kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Ilya Leoshkevich <iii@linux.ibm.com>,
        Ingo Molnar <mingo@redhat.com>, Jens Axboe <axboe@kernel.dk>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Kees Cook <keescook@chromium.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Matthew Wilcox <willy@infradead.org>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Pekka Enberg <penberg@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Petr Mladek <pmladek@suse.com>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Steven Rostedt <rostedt@goodmis.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Vegard Nossum <vegard.nossum@oracle.com>,
        Vlastimil Babka <vbabka@suse.cz>, kasan-dev@googlegroups.com,
        linux-mm@kvack.org, linux-arch@vger.kernel.org,
        linux-kernel@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Thu, 20 Oct 2022 at 22:55, youling 257 <youling257@gmail.com> wrote:
>
> How to use perf tool?

The simplest would be to try just "perf top" - and see which kernel
functions consume most CPU cycles. I would suggest you compare both
kernels, and see if you can spot a function which uses more cycles% in
the problematic kernel.