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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-message-info: rRom2fCzioq633kab+ac7ANPBunVFYyJQV4UtNjimsFlORluYaReGd9f5sOJXjChdQZft8lmBEud8omyYRb4vvXt073yqkhZipJV8HLS1XG5jw9pSkEAAHJZ09ltOKaTlfsI2RxH9RA9iHGnZNg0GN6ETwvJwZT8p3RpT+MHOI1AfuXjDc5pI7b8EZpkIIRARCQcFiu4uJx/+Bia9iCK67JPQOyS7XUKJwVLer4uB0tnCL47JVI03B1NxQX4Tul77DC5bRM4jiwMWNnwVNCitKJAIIPaQqG1BbVJV12rEM9FOgOTmLc1xO2vR7Enw25721HNgVqqE0k9t1ZyfG0rnowtQhm1T1RccuDecJ+qiWs= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 97c6c000-07a3-4860-6e77-08d610d645fc X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Sep 2018 13:15:50.8948 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0629 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christophe Leroy [ Upstream commit 21b8732eb4479b579bda9ee38e62b2c312c2a0e5 ] After update of kernel, the perf tool doesn't run anymore on my 32MB RAM powerpc board, but still runs on a 128MB RAM board: ~# strace perf execve("/usr/sbin/perf", ["perf"], [/* 12 vars */]) =3D -1 ENOMEM (Cannot= allocate memory) --- SIGSEGV {si_signo=3DSIGSEGV, si_code=3DSI_KERNEL, si_addr=3D0} --- +++ killed by SIGSEGV +++ Segmentation fault objdump -x shows that .bss section has a huge size of 24Mbytes: 27 .bss 016baca8 101cebb8 101cebb8 001cd988 2**3 With especially the following objects having quite big size: 10205f80 l O .bss 00140000 runtime_cycles_stats 10345f80 l O .bss 00140000 runtime_stalled_cycles_front_stats 10485f80 l O .bss 00140000 runtime_stalled_cycles_back_stats 105c5f80 l O .bss 00140000 runtime_branches_stats 10705f80 l O .bss 00140000 runtime_cacherefs_stats 10845f80 l O .bss 00140000 runtime_l1_dcache_stats 10985f80 l O .bss 00140000 runtime_l1_icache_stats 10ac5f80 l O .bss 00140000 runtime_ll_cache_stats 10c05f80 l O .bss 00140000 runtime_itlb_cache_stats 10d45f80 l O .bss 00140000 runtime_dtlb_cache_stats 10e85f80 l O .bss 00140000 runtime_cycles_in_tx_stats 10fc5f80 l O .bss 00140000 runtime_transaction_stats 11105f80 l O .bss 00140000 runtime_elision_stats 11245f80 l O .bss 00140000 runtime_topdown_total_slots 11385f80 l O .bss 00140000 runtime_topdown_slots_retired 114c5f80 l O .bss 00140000 runtime_topdown_slots_issued 11605f80 l O .bss 00140000 runtime_topdown_fetch_bubbles 11745f80 l O .bss 00140000 runtime_topdown_recovery_bubbles This is due to commit 4d255766d28b1 ("perf: Bump max number of cpus to 1024"), because many tables are sized with MAX_NR_CPUS This patch gives the opportunity to redefine MAX_NR_CPUS via $ make EXTRA_CFLAGS=3D-DMAX_NR_CPUS=3D1 Signed-off-by: Christophe Leroy Cc: Alexander Shishkin Cc: Peter Zijlstra Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/20170922112043.8349468C57@po15668-vm-win7.id= si0.si.c-s.fr Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/perf.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/perf/perf.h b/tools/perf/perf.h index 90129accffbe..4341ed267d4e 100644 --- a/tools/perf/perf.h +++ b/tools/perf/perf.h @@ -29,7 +29,9 @@ static inline unsigned long long rdclock(void) return ts.tv_sec * 1000000000ULL + ts.tv_nsec; } =20 +#ifndef MAX_NR_CPUS #define MAX_NR_CPUS 1024 +#endif =20 extern const char *input_name; extern bool perf_host, perf_guest; --=20 2.17.1