Christophe Leroy c39273ce0d perf tools: Allow overriding MAX_NR_CPUS at compile time ... [ Upstream commit 21b8732eb4 ] 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 4d255766d2 ("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> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-09-19 22:43:40 +02:00
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accounting
arch	tools headers: Synchronise x86 cpufeatures.h for L1TF additions	2018-08-15 18:13:01 +02:00
build	tools: build: Use HOSTLDFLAGS with fixdep	2018-08-24 13:09:17 +02:00
cgroup
firewire
gpio
hv	tools: hv: fix compiler warnings about major/target_fname	2018-05-30 07:52:36 +02:00
iio
include	tools: sync up .h files with the repective arch and uapi .h files	2018-05-30 12:19:59 +02:00
kvm/kvm_stat
laptop
leds
lib	tools/lib/subcmd/pager.c: do not alias select() params	2018-05-01 12:58:25 -07:00
net	bpf: fix uninitialized variable in bpf tools	2018-06-21 04:02:49 +09:00
nfsd
objtool	objtool: Support GCC 8 '-fnoreorder-functions'	2018-08-24 13:09:11 +02:00
pci
pcmcia
perf	perf tools: Allow overriding MAX_NR_CPUS at compile time	2018-09-19 22:43:40 +02:00
power	tools/power turbostat: Read extended processor family from CPUID	2018-09-05 09:26:30 +02:00
scripts	Kbuild: fix # escaping in .cmd files for future Make	2018-07-11 16:29:21 +02:00
spi
testing	selftests/bpf: fix a typo in map in map test	2018-09-19 22:43:38 +02:00
thermal/tmon	tools/thermal: tmon: fix for segfault	2018-05-30 07:52:28 +02:00
time
usb	tools: usb: ffs-test: Fix build on big endian systems	2018-09-05 09:26:26 +02:00
virtio
vm
Makefile