RDMA/core: Reduce cond_resched() frequency in __ib_umem_release

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The current implementation calls cond_resched() for every SG entry
in __ib_umem_release(), which can increase needless overhead.

This patch introduces RESCHED_LOOP_CNT_THRESHOLD (0x1000) to limit
how often cond_resched() is called. The function now yields the CPU
once every 4096 iterations, and yield at the very first iteration
for lots of small umem case, to reduce scheduling overhead.

Fixes: d056bc45b6 ("RDMA/core: Prevent soft lockup during large user memory region cleanup")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Link: https://patch.msgid.link/20251126025147.2627-1-lirongqing@baidu.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

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Li RongQing 2025-11-26 10:51:47 +08:00 • committed by Leon Romanovsky

parent 01dad9ca37

commit f37e286879

1 changed files with 5 additions and 1 deletions

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drivers/infiniband/core/umem.c

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