forked from Minki/linux
6a648b534d
When the vfs_getname() wannabe tracepoint is in place: # perf probe -l probe:vfs_getname (on getname_flags:73@acme/git/linux/fs/namei.c with pathname) # 'perf trace' will use it to get the pathname when it is copied from userspace to the kernel, right after syscalls:sys_enter_open, copied in the 'probe:vfs_getname', stash it somewhere and then, at syscalls:sys_exit_open time, if the 'open' return is not -1, i.e. a successfull open syscall, associate that pathname to this return, i.e. the fd. We were not doing this for the 'openat' syscall, which would cause 'perf trace' to fallback to using /proc to get the fd, change it so that we use what we got from probe:vfs_getname, reducing the 'openat' beautification process cost, ditching the syscalls performed to read procfs state and avoiding some possible races in the process. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-xnp44ao3bkb6ejeczxfnjwsh@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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.. | ||
accounting | ||
arch | ||
bpf | ||
build | ||
cgroup | ||
firewire | ||
gpio | ||
hv | ||
iio | ||
include | ||
kvm/kvm_stat | ||
laptop | ||
leds | ||
lib | ||
memory-model | ||
nfsd | ||
objtool | ||
pci | ||
pcmcia | ||
perf | ||
power | ||
scripts | ||
spi | ||
testing | ||
thermal/tmon | ||
time | ||
usb | ||
virtio | ||
vm | ||
wmi | ||
Makefile |