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debugobjects: Double the per CPU slots

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In situations where objects are rapidly allocated from the pool and handed
back, the size of the per CPU pool turns out to be too small.

Double the size of the per CPU pool.

This reduces the kmem cache allocation and free operations during a kernel compile:

     	     alloc    	    free
Baseline:    380k           330k
Double size: 295k	    245k

Especially the reduction of allocations is important because that happens
in the hot path when objects are initialized.

The maximum increase in per CPU pool memory consumption is about 2.5K per
online CPU, which is acceptable.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Zhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/all/20241007164914.378676302@linutronix.de
This commit is contained in:
Thomas Gleixner 2024-10-07 18:50:19 +02:00
parent 2638345d22
commit a201a96b96
1 changed files with 1 additions and 1 deletions
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2
lib/debugobjects.c
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@ -28,7 +28,7 @@
#define ODEBUG_POOL_SIZE (64 * ODEBUG_BATCH_SIZE)
#define ODEBUG_POOL_MIN_LEVEL (ODEBUG_POOL_SIZE / 4)
#define ODEBUG_POOL_PERCPU_SIZE (4 * ODEBUG_BATCH_SIZE)
#define ODEBUG_POOL_PERCPU_SIZE (8 * ODEBUG_BATCH_SIZE)
#define ODEBUG_CHUNK_SHIFT PAGE_SHIFT
#define ODEBUG_CHUNK_SIZE (1 << ODEBUG_CHUNK_SHIFT)