diff options
Diffstat (limited to 'doc/grep.texi')
| -rw-r--r-- | doc/grep.texi | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/grep.texi b/doc/grep.texi index 537237f6..5d779c11 100644 --- a/doc/grep.texi +++ b/doc/grep.texi @@ -689,7 +689,8 @@ This can cause a performance penalty. @item --mmap @opindex --mmap @cindex memory mapped input -This option is ignored for backwards compatibility. It used to read +This option is deprecated and now elicits a warning, but is otherwise a no-op. +It used to make @command{grep} read input with the @code{mmap} system call, instead of the default @code{read} system call. On modern systems, @code{mmap} would rarely if ever yield better performance. |