Messages in this thread Patch in this message | | | From | Alexey Dobriyan <> | Subject | [PATCH 06/13] proc: convert /proc/self to _print_integer() | Date | Tue, 28 Aug 2018 02:14:56 +0300 |
| |
Benchmark readlink("/proc/self") 2^23 times:
8.205992458 seconds time elapsed ( +- 0.15% ) 7.535168869 seconds time elapsed ( +- 0.09% )
-8.2%
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> --- fs/proc/self.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/fs/proc/self.c b/fs/proc/self.c index 127265e5c55f..b2279412237b 100644 --- a/fs/proc/self.c +++ b/fs/proc/self.c @@ -14,6 +14,7 @@ static const char *proc_self_get_link(struct dentry *dentry, { struct pid_namespace *ns = proc_pid_ns(inode); pid_t tgid = task_tgid_nr_ns(current, ns); + char buf[10], *p = buf + sizeof(buf); char *name; if (!tgid) @@ -22,7 +23,11 @@ static const char *proc_self_get_link(struct dentry *dentry, name = kmalloc(10 + 1, dentry ? GFP_KERNEL : GFP_ATOMIC); if (unlikely(!name)) return dentry ? ERR_PTR(-ENOMEM) : ERR_PTR(-ECHILD); - sprintf(name, "%u", tgid); + + p = _print_integer_u32(p, tgid); + memcpy(name, p, buf + sizeof(buf) - p); + name[buf + sizeof(buf) - p] = '\0'; + set_delayed_call(done, kfree_link, name); return name; } -- 2.16.4
| |