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authorKuniyuki Iwashima <kuniyu@amazon.com>2025-04-17 17:03:48 -0700
committerPaolo Abeni <pabeni@redhat.com>2025-04-24 09:29:56 +0200
commit5720a328c3e9802af48dd216c1c7eb0e91b61b6c (patch)
tree149643f66df8fbf8310c6b4be47cbad4311a5c3b /tools/perf/scripts/python/export-to-postgresql.py
parentipv6: Split ip6_route_info_create(). (diff)
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ipv6: Preallocate rt->fib6_nh->rt6i_pcpu in ip6_route_info_create().
ip6_route_info_create_nh() will be called under RCU. Then, fib6_nh_init() is also under RCU, but per-cpu memory allocation is very likely to fail with GFP_ATOMIC while bulk-adding IPv6 routes and we would see a bunch of this message in dmesg. percpu: allocation failed, size=8 align=8 atomic=1, atomic alloc failed, no space left percpu: allocation failed, size=8 align=8 atomic=1, atomic alloc failed, no space left Let's preallocate rt->fib6_nh->rt6i_pcpu in ip6_route_info_create(). If something fails before the original memory allocation in fib6_nh_init(), ip6_route_info_create_nh() calls fib6_info_release(), which releases the preallocated per-cpu memory. Note that rt->fib6_nh->rt6i_pcpu is not preallocated when called via ipv6_stub, so we still need alloc_percpu_gfp() in fib6_nh_init(). Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Link: https://patch.msgid.link/20250418000443.43734-8-kuniyu@amazon.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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