linux/arch/um/include/asm/cacheflush.h

#ifndef __UM_ASM_CACHEFLUSH_H
#define __UM_ASM_CACHEFLUSH_H

#include <asm/tlbflush.h>
#define flush_cache_vmap flush_tlb_kernel_range
#define flush_cache_vunmap flush_tlb_kernel_range

#include <asm-generic/cacheflush.h>
#endif /* __UM_ASM_CACHEFLUSH_H */
um: implement flush_cache_vmap/flush_cache_vunmap vmalloc() heavy workloads in UML are extremely slow, due to flushing the entire kernel VM space (flush_tlb_kernel_vm()) on the first segfault. Implement flush_cache_vmap() to avoid that, and while at it also add flush_cache_vunmap() since it's trivial. This speeds up my vmalloc() heavy test of copying files out from /sys/kernel/debug/gcov/ by 30x (from 30s to 1s.) Signed-off-by: Johannes Berg <johannes.berg@intel.com> Acked-By: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at> 2021-03-15 23:38:04 +01:00			`#ifndef __UM_ASM_CACHEFLUSH_H`
			`#define __UM_ASM_CACHEFLUSH_H`

			`#include <asm/tlbflush.h>`
			`#define flush_cache_vmap flush_tlb_kernel_range`
			`#define flush_cache_vunmap flush_tlb_kernel_range`

			`#include <asm-generic/cacheflush.h>`
			`#endif /* __UM_ASM_CACHEFLUSH_H */`