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| author | Alexei Starovoitov <ast@kernel.org> | 2025-03-31 03:28:09 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-04-12 03:32:36 +0300 |
| commit | c5bb27e2da3a6e1006f3e0aeb36d57c1dd1144aa (patch) | |
| tree | af7e7c3c013ab4d128954fcdd9512b465ff76ffa /drivers/fpga/tests/fpga-bridge-test.c | |
| parent | a84edd52f0a0fa193f0f685769939cf84510755b (diff) | |
| download | linux-c5bb27e2da3a6e1006f3e0aeb36d57c1dd1144aa.tar.xz | |
mm/page_alloc: avoid second trylock of zone->lock
spin_trylock followed by spin_lock will cause extra write cache access.
If the lock is contended it may cause unnecessary cache line bouncing and
will execute redundant irq restore/save pair. Therefore, check
alloc/fpi_flags first and use spin_trylock or spin_lock.
Link: https://lkml.kernel.org/r/20250331002809.94758-1-alexei.starovoitov@gmail.com
Fixes: 97769a53f117 ("mm, bpf: Introduce try_alloc_pages() for opportunistic page allocation")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Harry Yoo <harry.yoo@oracle.com>
Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Daniel Borkman <daniel@iogearbox.net>
Cc: Martin KaFai Lau <martin.lau@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'drivers/fpga/tests/fpga-bridge-test.c')
0 files changed, 0 insertions, 0 deletions