[commit: ghc] master: Add +RTS -F to the --help output (015dd8a)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/015dd8ab64e2cf8dd82845fec9b1daf5fedbf55b/ghc

>---------------------------------------------------------------

commit 015dd8ab64e2cf8dd82845fec9b1daf5fedbf55b
Author: Simon Marlow <marlowsd at gmail.com>
Date:   Tue Dec 11 13:02:37 2018 -0500

    Add +RTS -F to the --help output
    
    Test Plan: `./inplace/bin/ghc-stage2 +RTS --help"
    
    Reviewers: bgamari, sgraf, erikd
    
    Reviewed By: sgraf
    
    Subscribers: adamse, rwbarton, carter
    
    Differential Revision: https://phabricator.haskell.org/D5428


>---------------------------------------------------------------

015dd8ab64e2cf8dd82845fec9b1daf5fedbf55b
 rts/RtsFlags.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/rts/RtsFlags.c b/rts/RtsFlags.c
index 0aa0b62..78e70dd 100644
--- a/rts/RtsFlags.c
+++ b/rts/RtsFlags.c
@@ -284,6 +284,8 @@ usage_text[] = {
 "  -A<size>  Sets the minimum allocation area size (default 1m) Egs: -A20m -A10k",
 "  -AL<size> Sets the amount of large-object memory that can be allocated",
 "            before a GC is triggered (default: the value of -A)",
+"  -F<n>     Sets the collecting threshold for old generations as a factor of"
+"            the live data in that generation the last time it was collected."
 "  -n<size>  Allocation area chunk size (0 = disabled, default: 0)",
 "  -O<size>  Sets the minimum size of the old generation (default 1M)",
 "  -M<size>  Sets the maximum heap size (default unlimited)  Egs: -M256k -M1G",