From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Clark Williams <williams@redhat.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Christophe Leroy <christophe.leroy@c-s.fr>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
linuxppc-dev@lists.ozlabs.org,
Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: [PATCH 19/21] perf tools: Allow overriding MAX_NR_CPUS at compile time
Date: Wed, 1 Aug 2018 18:36:46 -0300 [thread overview]
Message-ID: <20180801213648.4814-20-acme@kernel.org> (raw)
In-Reply-To: <20180801213648.4814-1-acme@kernel.org>
From: Christophe Leroy <christophe.leroy@c-s.fr>
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 */]) = -1 ENOMEM (Cannot allocate memory)
--- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} ---
+++ 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=-DMAX_NR_CPUS=1
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/20170922112043.8349468C57@po15668-vm-win7.idsi0.si.c-s.fr
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/perf.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index d215714f48df..21bf7f5a3cf5 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -25,7 +25,9 @@ static inline unsigned long long rdclock(void)
return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
}
+#ifndef MAX_NR_CPUS
#define MAX_NR_CPUS 1024
+#endif
extern const char *input_name;
extern bool perf_host, perf_guest;
--
2.14.4
next prev parent reply other threads:[~2018-08-01 21:36 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-01 21:36 [GIT PULL 00/21] perf/core improvements and fixes Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 01/21] perf trace beauty: Default header_dir to cwd to work without parms Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 02/21] perf evlist: Fix error out while applying initial delay and LBR Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 03/21] perf tests: Fix complex event name parsing Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 04/21] tools include uapi: Grab a copy of linux/in.h Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 05/21] perf beauty: Add a generator for IPPROTO_ socket's protocol constants Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 06/21] perf trace beauty: Do not print NULL strarray entries Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 07/21] perf trace beauty: Add beautifiers for 'socket''s 'protocol' arg Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 08/21] perf trace: Beautify the AF_INET & AF_INET6 'socket' syscall 'protocol' args Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 09/21] perf tests: Fix indexing when invoking subtests Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 10/21] perf c2c report: Fix crash for empty browser Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 11/21] perf build: Fix installation directory for eBPF Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 12/21] perf cs-etm: Fix start tracing packet handling Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 13/21] perf cs-etm: Support dummy address value for CS_ETM_TRACE_ON packet Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 14/21] perf cs-etm: Generate branch sample when receiving a " Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 15/21] perf cs-etm: Generate branch sample for " Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 16/21] perf vendor events arm64: Update ThunderX2 implementation defined pmu core events Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 17/21] perf list: Unify metric group description format with PMU event description Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 18/21] perf bpf: Show better message when failing to load an object Arnaldo Carvalho de Melo
2018-08-01 21:36 ` Arnaldo Carvalho de Melo [this message]
2018-08-01 21:36 ` [PATCH 20/21] perf bpf: Include uapi/linux/bpf.h from the 'perf trace' script's bpf.h Arnaldo Carvalho de Melo
2018-08-01 21:36 ` [PATCH 21/21] perf trace: Do not require --no-syscalls to suppress strace like output Arnaldo Carvalho de Melo
2018-08-02 8:03 ` [GIT PULL 00/21] perf/core improvements and fixes Ingo Molnar
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