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top: introduced new focus toggle ('F'), program source

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Sometimes, it might be useful to isolate a parent task
and its forked children from other system activity. As
an example, a user might want to examine workload in a
specific lxc container. Or maybe there is some need to
question what's happening under the same tmux session.

Since forest view mode tends to be a relatively stable
display, it will sometimes satisfy the above need. But
that mode can't currently guarantee the target process
always remains as the topmost task or even is visible.

So, this patch will enable focusing on any parent task
and keeping it as the topmost process while displaying
it and its forked children only. It then appears as if
there is no other activity in that system by virtue of
the blank lines which follow that final child process.

To implement this new feature, top's redundant 'F' key
has been repurposed. It made little sense devoting two
keys to the Fields Management screen (especially since
the key we've taken required two separate keystrokes).

[ and while we're at it, i also added punctuation to ]
[ the prologue for that renamed 'forest_display' guy ]
[ since all other forest functions used punctuation. ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2021-07-24 00:00:00 -05:00
committed by Craig Small
parent 8c2622aea8
commit 3e922e671d
3 changed files with 72 additions and 28 deletions
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4
top/top_nls.c
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@@ -594,7 +594,7 @@ static void build_uniq_nlstab (void) {
" Z~5,~1B~5,E,e Global: '~1Z~2' colors; '~1B~2' bold; '~1E~2'/'~1e~2' summary/task memory scale\n"
" l,t,m,I Toggle: '~1l~2' load avg; '~1t~2' task/cpu; '~1m~2' memory; '~1I~2' Irix mode\n"
" 0,1,2,3,4 Toggle: '~10~2' zeros; '~11~2/~12~2/~13~2' cpu/numa views; '~14~2' cpus two abreast\n"
" f,F,X Fields: '~1f~2'/'~1F~2' add/remove/order/sort; '~1X~2' increase fixed-width\n"
" f,X Fields: '~1f~2' add/remove/order/sort; '~1X~2' increase fixed-width fields\n"
"\n"
" L,&,<,> . Locate: '~1L~2'/'~1&~2' find/again; Move sort column: '~1<~2'/'~1>~2' left/right\n"
" R,H,J,C . Toggle: '~1R~2' Sort; '~1H~2' Threads; '~1J~2' Num justify; '~1C~2' Coordinates\n"
@@ -603,7 +603,7 @@ static void build_uniq_nlstab (void) {
" z~5,~1b~5 . Toggle: '~1z~2' color/mono; '~1b~2' bold/reverse (only if 'x' or 'y')\n"
" u,U,o,O . Filter by: '~1u~2'/'~1U~2' effective/any user; '~1o~2'/'~1O~2' other criteria\n"
" n,#,^O . Set: '~1n~2'/'~1#~2' max tasks displayed; Show: ~1Ctrl~2+'~1O~2' other filter(s)\n"
" V,v . Toggle: '~1V~2' forest view; '~1v~2' hide/show forest view children\n"
" V,v,F . Toggle: '~1V~2' forest view; '~1v~2' hide/show children; '~1F~2' keep focused\n"
"\n"
"%s"
" W,Y,! Write config file '~1W~2'; Inspect other output '~1Y~2'; Combine Cpus '~1!~2'\n"