use vmalloc=<size> to increase size

最新推荐文章于 2023-05-25 14:08:36 发布

velanjun

最新推荐文章于 2023-05-25 14:08:36 发布

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本文探讨了Linux内核中vmap分配内存失败的问题，并介绍了如何通过调整vmalloc参数来改变vmalloc区域大小的方法，从而解决内存分配失败的情况。

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vmap allocation for size 3084288 failed: use vmalloc=<size> to increase size.

内核参数增加比如：vmalloc=512M

mmu.c @arch/arm/mm/

static void * __initdata vmalloc_min =

(void *)(VMALLOC_END - (240 << 20) - VMALLOC_OFFSET);

/*
* vmalloc=size forces the vmalloc area to be exactly 'size'
* bytes. This can be used to increase (or decrease) the vmalloc
* area - the default is 240m.
*/
static int __init early_vmalloc(char *arg)
{
unsigned long vmalloc_reserve = memparse(arg, NULL);

if (vmalloc_reserve < SZ_16M) {
vmalloc_reserve = SZ_16M;
pr_warn("vmalloc area too small, limiting to %luMB\n",
vmalloc_reserve >> 20);
}

if (vmalloc_reserve > VMALLOC_END - (PAGE_OFFSET + SZ_32M)) {
vmalloc_reserve = VMALLOC_END - (PAGE_OFFSET + SZ_32M);
pr_warn("vmalloc area is too big, limiting to %luMB\n",
vmalloc_reserve >> 20);
}

vmalloc_min = (void *)(VMALLOC_END - vmalloc_reserve);
return 0;
}
early_param("vmalloc", early_vmalloc);