diff options
author | Gal Pressman <galpress@amazon.com> | 2021-04-29 09:48:03 +0300 |
---|---|---|
committer | David Ahern <dsahern@kernel.org> | 2021-05-03 14:43:13 +0000 |
commit | bce424786969241d9f01913e5b9ed07c6ba74be9 (patch) | |
tree | 7c11da18f978ce8a46c744425c1dd5e5ff23f7b7 /rdma | |
parent | 212e2c1d0cb27f0d1f87b9cc6454b8afbeb2d467 (diff) | |
download | iproute2-bce424786969241d9f01913e5b9ed07c6ba74be9.tar.gz |
rdma: Add copy-on-fork to get sys command
The new attribute indicates that the kernel copies DMA pages on fork,
hence fork support through madvise and MADV_DONTFORK is not needed.
If the attribute is not reported (expected on older kernels),
copy-on-fork is disabled.
Example:
$ rdma sys
netns shared copy-on-fork on
Signed-off-by: Gal Pressman <galpress@amazon.com>
Acked-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David Ahern <dsahern@kernel.org>
Diffstat (limited to 'rdma')
-rw-r--r-- | rdma/sys.c | 11 |
1 files changed, 10 insertions, 1 deletions
@@ -20,6 +20,7 @@ static const char *netns_modes_str[] = { static int sys_show_parse_cb(const struct nlmsghdr *nlh, void *data) { struct nlattr *tb[RDMA_NLDEV_ATTR_MAX] = {}; + bool cof = false; mnl_attr_parse(nlh, 0, rd_attr_cb, tb); @@ -35,9 +36,17 @@ static int sys_show_parse_cb(const struct nlmsghdr *nlh, void *data) else mode_str = "unknown"; - print_color_string(PRINT_ANY, COLOR_NONE, "netns", "netns %s\n", + print_color_string(PRINT_ANY, COLOR_NONE, "netns", "netns %s ", mode_str); } + + if (tb[RDMA_NLDEV_SYS_ATTR_COPY_ON_FORK]) + cof = mnl_attr_get_u8(tb[RDMA_NLDEV_SYS_ATTR_COPY_ON_FORK]); + + print_color_on_off(PRINT_ANY, COLOR_NONE, "copy-on-fork", + "copy-on-fork %s\n", + cof); + return MNL_CB_OK; } |