https://github.com/torvalds/linux
Revision 1fda5bb66ad8fb24ecb3858e61a13a6548428898 authored by Yonghong Song on 11 November 2023, 01:39:28 UTC, committed by Alexei Starovoitov on 15 November 2023, 15:51:06 UTC
Kirill Shutemov reported significant percpu memory consumption increase after booting in 288-cpu VM ([1]) due to commit 41a5db8d8161 ("bpf: Add support for non-fix-size percpu mem allocation"). The percpu memory consumption is increased from 111MB to 969MB. The number is from /proc/meminfo. I tried to reproduce the issue with my local VM which at most supports upto 255 cpus. With 252 cpus, without the above commit, the percpu memory consumption immediately after boot is 57MB while with the above commit the percpu memory consumption is 231MB. This is not good since so far percpu memory from bpf memory allocator is not widely used yet. Let us change pre-allocation in init stage to on-demand allocation when verifier detects there is a need of percpu memory for bpf program. With this change, percpu memory consumption after boot can be reduced signicantly. [1] https://lore.kernel.org/lkml/20231109154934.4saimljtqx625l3v@box.shutemov.name/ Fixes: 41a5db8d8161 ("bpf: Add support for non-fix-size percpu mem allocation") Reported-and-tested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Yonghong Song <yonghong.song@linux.dev> Acked-by: Hou Tao <houtao1@huawei.com> Link: https://lore.kernel.org/r/20231111013928.948838-1-yonghong.song@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>
1 parent e2e57d6
Tip revision: 1fda5bb66ad8fb24ecb3858e61a13a6548428898 authored by Yonghong Song on 11 November 2023, 01:39:28 UTC
bpf: Do not allocate percpu memory at init stage
bpf: Do not allocate percpu memory at init stage
Tip revision: 1fda5bb
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arch | ||
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certs | ||
crypto | ||
drivers | ||
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include | ||
init | ||
io_uring | ||
ipc | ||
kernel | ||
lib | ||
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net | ||
rust | ||
samples | ||
scripts | ||
security | ||
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tools | ||
usr | ||
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.cocciconfig | -rw-r--r-- | 59 bytes |
.get_maintainer.ignore | -rw-r--r-- | 151 bytes |
.gitattributes | -rw-r--r-- | 105 bytes |
.gitignore | -rw-r--r-- | 2.0 KB |
.mailmap | -rw-r--r-- | 35.9 KB |
.rustfmt.toml | -rw-r--r-- | 369 bytes |
COPYING | -rw-r--r-- | 496 bytes |
CREDITS | -rw-r--r-- | 100.0 KB |
Kbuild | -rw-r--r-- | 2.5 KB |
Kconfig | -rw-r--r-- | 555 bytes |
MAINTAINERS | -rw-r--r-- | 717.0 KB |
Makefile | -rw-r--r-- | 65.7 KB |
README | -rw-r--r-- | 727 bytes |
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