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57380fd124
Add cpu_relax() for arm64 instead of directly assert(), and add assert.h
header file. Also, add smp_wmb and smp_mb for arm64.
Compilation error as follows, avoid __always_inline undefined.
$ make
cc -Wall -pthread -O2 -ggdb -flto -fwhole-program -c -o ring.o ring.c
In file included from ring.c:10:
main.h: In function ‘busy_wait’:
main.h:99:21: warning: implicit declaration of function ‘assert’
[-Wimplicit-function-declaration]
99 | #define cpu_relax() assert(0)
| ^~~~~~
main.h:107:17: note: in expansion of macro ‘cpu_relax’
107 | cpu_relax();
| ^~~~~~~~~
main.h:12:1: note: ‘assert’ is defined in header ‘<assert.h>’; did you
forget to ‘#include <assert.h>’?
11 | #include <stdbool.h>
+++ |+#include <assert.h>
12 |
main.h: At top level:
main.h:143:23: error: expected ‘;’ before ‘void’
143 | static __always_inline
| ^
| ;
144 | void __read_once_size(const volatile void *p, void *res, int
size)
| ~~~~
main.h:158:23: error: expected ‘;’ before ‘void’
158 | static __always_inline void __write_once_size(volatile void *p,
void *res, int size)
| ^~~~~
| ;
make: *** [<builtin>: ring.o] Error 1
Signed-off-by: Rong Tao <rongtao@cestc.cn>
Message-Id: <tencent_F53E159DD7925174445D830DA19FACF44B07@qq.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|
||
|---|---|---|
| .. | ||
| main.c | ||
| main.h | ||
| Makefile | ||
| noring.c | ||
| ptr_ring.c | ||
| README | ||
| ring.c | ||
| run-on-all.sh | ||
| virtio_ring_0_9.c | ||
| virtio_ring_inorder.c | ||
| virtio_ring_poll.c | ||
Partial implementation of various ring layouts, useful to tune virtio design. Uses shared memory heavily. Typical use: # sh run-on-all.sh perf stat -r 10 --log-fd 1 -- ./ring