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authorZhipeng Xie <xiezhipeng1@huawei.com>2022-02-09 15:54:17 +0100
committerPeter Zijlstra <peterz@infradead.org>2022-04-19 21:15:42 +0200
commit60490e7966659b26d74bf1fa4aa8693d9a94ca88 (patch)
treea14ccb4487d1e3938f0cc525803dd989999f12fb /arch/x86/events/intel/cstate.c
parentLinux 5.18-rc3 (diff)
downloadlinux-60490e7966659b26d74bf1fa4aa8693d9a94ca88.tar.xz
linux-60490e7966659b26d74bf1fa4aa8693d9a94ca88.zip
perf/core: Fix perf_mmap fail when CONFIG_PERF_USE_VMALLOC enabled
This problem can be reproduced with CONFIG_PERF_USE_VMALLOC enabled on both x86_64 and aarch64 arch when using sysdig -B(using ebpf)[1]. sysdig -B works fine after rebuilding the kernel with CONFIG_PERF_USE_VMALLOC disabled. I tracked it down to the if condition event->rb->nr_pages != nr_pages in perf_mmap is true when CONFIG_PERF_USE_VMALLOC is enabled where event->rb->nr_pages = 1 and nr_pages = 2048 resulting perf_mmap to return -EINVAL. This is because when CONFIG_PERF_USE_VMALLOC is enabled, rb->nr_pages is always equal to 1. Arch with CONFIG_PERF_USE_VMALLOC enabled by default: arc/arm/csky/mips/sh/sparc/xtensa Arch with CONFIG_PERF_USE_VMALLOC disabled by default: x86_64/aarch64/... Fix this problem by using data_page_nr() [1] https://github.com/draios/sysdig Fixes: 906010b2134e ("perf_event: Provide vmalloc() based mmap() backing") Signed-off-by: Zhipeng Xie <xiezhipeng1@huawei.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20220209145417.6495-1-xiezhipeng1@huawei.com
Diffstat (limited to 'arch/x86/events/intel/cstate.c')
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