diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libc/sys/copy_file_range.2 | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/lib/libc/sys/copy_file_range.2 b/lib/libc/sys/copy_file_range.2 index a3f714f0e7e8..22106b397ef2 100644 --- a/lib/libc/sys/copy_file_range.2 +++ b/lib/libc/sys/copy_file_range.2 @@ -25,7 +25,7 @@ .\" .\" $FreeBSD$ .\" -.Dd March 30, 2020 +.Dd January 2, 2021 .Dt COPY_FILE_RANGE 2 .Os .Sh NAME @@ -117,6 +117,15 @@ with .Dv SEEK_DATA arguments and this system call for the data ranges found. +.Pp +For best performance, call +.Fn copy_file_range +with the largest +.Fa len +value possible. +It is interruptible on most file systems, +so there is no penalty for using very large len values, even SSIZE_MAX. +.Pp .Sh RETURN VALUES If it succeeds, the call returns the number of bytes copied, which can be fewer than |