Re: [PATCH v2 3/4] mm/vmalloc: Use kvmalloc to allocate the table of pages

[David Rientjes]

On Wed, 24 Mar 2021, Matthew Wilcox (Oracle) wrote:

> If we're trying to allocate 4MB of memory, the table will be 8KiB in size
> (1024 pointers * 8 bytes per pointer), which can usually be satisfied
> by a kmalloc (which is significantly faster).  Instead of changing this
> open-coded implementation, just use kvmalloc().
> 
> This improves the allocation speed of vmalloc(4MB) by approximately
> 5% in our benchmark.  It's still dominated by the 1024 calls to
> alloc_pages_node(), which will be the subject of a later patch.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>

Acked-by: David Rientjes <rientjes@xxxxxxxxxx>