Unverified Commit aa5736dc authored by Charlie Jenkins's avatar Charlie Jenkins Committed by Palmer Dabbelt
Browse files

tools: Optimize ring buffer for riscv 



Now that the riscv tools tree supports optimized barriers, use them in
the ring buffer.

Signed-off-by: default avatarCharlie Jenkins <charlie@rivosinc.com>
Reviewed-by: default avatarAndrea Parri <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/20240806-optimize_ring_buffer_read_riscv-v2-2-ca7e193ae198@rivosinc.com


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 6d74d178

tools/include/linux/ring_buffer.h

+1 −1
Original line number Diff line number Diff line
@@ -55,7 +55,7 @@ static inline u64 ring_buffer_read_head(struct perf_event_mmap_page *base) 
 * READ_ONCE() + smp_mb() pair.

 */

#if defined(__x86_64__) || defined(__aarch64__) || defined(__powerpc64__) || \

    defined(__ia64__) || defined(__sparc__) && defined(__arch64__)

    defined(__ia64__) || defined(__sparc__) && defined(__arch64__) || defined(__riscv)

	return smp_load_acquire(&base->data_head);

#else

	u64 head = READ_ONCE(base->data_head);