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Date: Mon, 7 May 2018 17:34:16 -0700 From: Andi Kleen <ak@...ux.intel.com> To: Josh Hunt <johunt@...mai.com> Cc: mingo@...hat.com, acme@...nel.org, peterz@...radead.org, alexander.shishkin@...ux.intel.com, jolsa@...hat.com, namhyung@...nel.org, wangnan0@...wei.com, linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, eranian@...gle.com, kirill.shutemov@...ux.intel.com Subject: Re: [PATCH v2] perf tools: allow map files to specify DSO On Mon, May 07, 2018 at 02:30:32PM -0700, Josh Hunt wrote: > On 05/07/2018 11:40 AM, Andi Kleen wrote: > > On Mon, May 07, 2018 at 02:24:16PM -0400, Josh Hunt wrote: > > > Add the ability to specify a DSO in the /tmp/perf-<PID>.map file. > > > The DSO should be the first line in the file and readable by the > > > running user. If a valid DSO is found all other contents of the > > > file will be ignored. This allows things like callchain unwinding > > > with DWARF to work. > > > > FWIW it's ok, but also obsolete with Kirill's large-pages-in-tmpfs > > work in newer kernels. With that you can just copy the executable into > > a 2MB tmpfs and disable the manual huge page copying and everything > > should work as usually. > > > > So essentially it's only a hack for old kernels and old binaries. > > > > But doesn't hurt I guess. > > Ah, very interesting. I wasn't aware of this. Can you point me to some more > details on this process? See commit 5a6e75f8110c97e2a5488894d4e922187e6cb343 -Andi
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