83024 - nsClipboard::FindSelectionNotifyEvent takes 4% of new window time (XSync)

Status: RESOLVED WORKSFORME

(Core :: XUL, defect, P3)

Description

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

nsClipboard::SendClipPing took 4% of new window time in a profile I took of
repeatedly opening new windows -- all of this time is in the call to XSync.  Is
this call to XSync really necessary?  Could it be XFlush instead?

Comment 1

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Should've mentioned I'm profiling the GTK port.

Comment 2

[James Green]

CC self and adding keywords.

Comment 3

[Peter Trudelle]

->pink

Comment 4

[Mike Pinkerton (not reading bugmail)]

dr was talking about this today.

Comment 5

[Dan Rosen]

I opened bug 83395 to track abuses of X. Not sure when I'll be able to tackle
the issue as a whole, but targeting this as 0.9.3 for now...

Comment 6

[Dan Rosen]

dbaron: Are we calling SendClipPing an unusually large amount of times, or are
we calling it once and spending forever in a single XSync call?

Comment 7

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

We were calling it once.  (What does this code do?  I don't even understand what
it does so it's hard for me to know why it needs to be an XSync rather than XFlush.)

Comment 8

[Dan Rosen]

What does this code do? Beats me, I've never looked at it. I'll have a look when
I get the chance.

Comment 9

[Christopher Blizzard (:blizzard)]

This is pav-code.  He's knows it best.  I don't know if I've ever looked at it.

Comment 10

[John Morrison]

May God have mercy on us all. The 212 bug spam-o-rama is Now!

Comment 11

[Dan Rosen]

[spam] [e-mail]'s bugs subject to redistribution by chofmann. R!

Comment 12

[chris hofmann]

dp, can you have a look and see where this one should land?

Comment 13

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

I think this code has since changed a bit so that the time is spent in PR_Sleep
instead of XSync, but I think the problem is still there...

Comment 14

[Suresh Duddi (gone)]

Changing summary: FindSelectionNotifyEvent() seems to go into a tightloop with a
timeout to get the selection. The big question is why would it do this on new
window.

Comment 15

[Suresh Duddi (gone)]

I see FindSelectionNotifyEvent() event happening for mailcompose window but not
for browser windows. I guess the key is it happens whenever a text field gets
focus and the reason being to highlight paste if there was something to paste.

(gdb) bt 8
#0  nsClipboard::FindSelectionNotifyEvent (this=0x8c09eb0)
    at nsClipboard.cpp:1317
#1  0x40c4422f in nsClipboard::GetTargets (this=0x8c09eb0, aSelectionAtom=203)
    at nsClipboard.cpp:1209
#2  0x40c42f10 in nsClipboard::HasDataMatchingFlavors (this=0x8c09eb0, 
    aFlavorList=0x424f4ba8, aWhichClipboard=1, outResult=0xbfff1624)
    at nsClipboard.cpp:759
#3  0x428c63a0 in nsPlaintextEditor::CanPaste (this=0x422d7940, 
    aSelectionType=1, aCanPaste=0xbfff198c) at nsPlaintextDataTransfer.cpp:624
#4  0x428f3f87 in nsPasteCommand::IsCommandEnabled (this=0x8852180, 
    aCommandName=@0x42405958, aCommandRefCon=0x422d7940, 
    outCmdEnabled=0xbfff198c) at nsEditorCommands.cpp:228
#5  0x4166e7c0 in nsControllerCommandManager::IsCommandEnabled (
    this=0x8851e60, aCommandName=@0x42405958, aCommandRefCon=0x422d7940, 
    aResult=0xbfff198c) at nsControllerCommandManager.cpp:131
#6  0x428f8fd4 in nsEditorController::IsCommandEnabled (this=0x42426d68, 
    aCommand=@0x42405958, aResult=0xbfff198c) at nsEditorController.cpp:196
#7  0x4021c7c5 in XPTC_InvokeByIndex (that=0x42426d68, methodIndex=3, 
    paramCount=2, params=0xbfff197c) at xptcinvoke_unixish_x86.cpp:153
(More stack frames follow...)
(gdb) bt 
#0  nsClipboard::FindSelectionNotifyEvent (this=0x8c09eb0)
    at nsClipboard.cpp:1317
#1  0x40c4422f in nsClipboard::GetTargets (this=0x8c09eb0, aSelectionAtom=203)
    at nsClipboard.cpp:1209
#2  0x40c42f10 in nsClipboard::HasDataMatchingFlavors (this=0x8c09eb0, 
    aFlavorList=0x424f4ba8, aWhichClipboard=1, outResult=0xbfff1624)
    at nsClipboard.cpp:759
#3  0x428c63a0 in nsPlaintextEditor::CanPaste (this=0x422d7940, 
    aSelectionType=1, aCanPaste=0xbfff198c) at nsPlaintextDataTransfer.cpp:624
#4  0x428f3f87 in nsPasteCommand::IsCommandEnabled (this=0x8852180, 
    aCommandName=@0x42405958, aCommandRefCon=0x422d7940, 
    outCmdEnabled=0xbfff198c) at nsEditorCommands.cpp:228
#5  0x4166e7c0 in nsControllerCommandManager::IsCommandEnabled (
    this=0x8851e60, aCommandName=@0x42405958, aCommandRefCon=0x422d7940, 
    aResult=0xbfff198c) at nsControllerCommandManager.cpp:131
#6  0x428f8fd4 in nsEditorController::IsCommandEnabled (this=0x42426d68, 
    aCommand=@0x42405958, aResult=0xbfff198c) at nsEditorController.cpp:196
#7  0x4021c7c5 in XPTC_InvokeByIndex (that=0x42426d68, methodIndex=3, 
    paramCount=2, params=0xbfff197c) at xptcinvoke_unixish_x86.cpp:153
#8  0x40d928a6 in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libxpconnect.so
#9  0x40d9b287 in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libxpconnect.so
#10 0x4009f85b in ?? () from /export2/dp/trunk/mozilla/dist/bin/./libmozjs.so
#11 0x400aed42 in ?? () from /export2/dp/trunk/mozilla/dist/bin/./libmozjs.so
#12 0x4009f8d8 in ?? () from /export2/dp/trunk/mozilla/dist/bin/./libmozjs.so
#13 0x4009fc4f in ?? () from /export2/dp/trunk/mozilla/dist/bin/./libmozjs.so
#14 0x4006e66d in ?? () from /export2/dp/trunk/mozilla/dist/bin/./libmozjs.so
#15 0x41b5130d in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libjsdom.so
#16 0x41b947d5 in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libjsdom.so
#17 0x41506bd7 in nsEventListenerManager::HandleEventSubType (this=0x895ede8, 
    aListenerStruct=0x8b4d708, aDOMEvent=0x42257408, aCurrentTarget=0x8c42c18, 
    aSubType=32, aPhaseFlags=7) at nsEventListenerManager.cpp:1210
#18 0x4150a515 in nsEventListenerManager::HandleEvent (this=0x895ede8, 
    aPresContext=0x422f3f30, aEvent=0xbfff3824, aDOMEvent=0xbfff3698, 
    aCurrentTarget=0x8c42c18, aFlags=7, aEventStatus=0xbfff3750)
    at nsEventListenerManager.cpp:2200
#19 0x4165f18c in nsXULElement::HandleDOMEvent (this=0x8c42c10, 
    aPresContext=0x422f3f30, aEvent=0xbfff3824, aDOMEvent=0xbfff3698, 
    aFlags=1, aEventStatus=0xbfff3750) at nsXULElement.cpp:3426
#20 0x4167161f in nsXULCommandDispatcher::UpdateCommands (this=0x424875a8, 
    aEventName=@0xbfff3a0c) at nsXULCommandDispatcher.cpp:380
#21 0x41b61e82 in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libjsdom.so
#22 0x41b53c4b in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libjsdom.so
#23 0x41b53a32 in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libjsdom.so
#24 0x41b54881 in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libjsdom.so
#25 0x41508a34 in nsEventListenerManager::HandleEvent (this=0x42454858, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aCurrentTarget=0x424547d8, aFlags=4, aEventStatus=0xbfffb578)
    at nsEventListenerManager.cpp:1698
#26 0x41b7c1ea in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libjsdom.so
#27 0x41b57d54 in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libjsdom.so
#28 0x4167fd80 in nsXULDocument::HandleDOMEvent (this=0x4242f468, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULDocument.cpp:2432
#29 0x4165f01f in nsXULElement::HandleDOMEvent (this=0x42478018, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3410
#30 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x8961040, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#31 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x8b3e2a8, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#32 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x8b52ee0, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#33 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x895e498, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#34 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x8b55438, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#35 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x8b5b4a0, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#36 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x8c1a3b0, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#37 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x426026a0, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#38 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x422d5b88, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#39 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x42487460, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#40 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x424b2768, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#41 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x424e30d0, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#42 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x42652c50, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#43 0x4165efd8 in nsXULElement::HandleDOMEvent (this=0x42458270, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=4, aEventStatus=0xbfffb578) at nsXULElement.cpp:3406
#44 0x41749e57 in nsGenericElement::HandleDOMEvent (this=0x424008b0, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0xbfffafe4, 
    aFlags=1, aEventStatus=0xbfffb578) at nsGenericElement.cpp:1845
#45 0x4156c22d in nsHTMLInputElement::HandleDOMEvent (this=0x424008b0, 
    aPresContext=0x422f3f30, aEvent=0xbfffb52c, aDOMEvent=0x0, aFlags=1, 
    aEventStatus=0xbfffb578) at nsHTMLInputElement.cpp:1147
#46 0x4151ca5e in nsEventStateManager::SendFocusBlur (this=0x424004d8, 
    aPresContext=0x422f3f30, aContent=0x424008b0)
    at nsEventStateManager.cpp:3611
#47 0x41519eb9 in nsEventStateManager::SetContentState (this=0x424004d8, 
    aContent=0x424008b0, aState=2) at nsEventStateManager.cpp:3306
#48 0x4156a7e6 in nsHTMLInputElement::SetFocus (this=0x424008b0, 
    aPresContext=0x422f3f30) at nsHTMLInputElement.cpp:742
#49 0x41534fd2 in nsGenericHTMLElement::SetElementFocus (this=0x424008b0, 
    aDoFocus=1) at nsGenericHTMLElement.cpp:4331
#50 0x4156a3d0 in nsHTMLInputElement::Focus (this=0x424008b0)
    at nsHTMLInputElement.cpp:703
#51 0x4021c7c5 in XPTC_InvokeByIndex (that=0x424008dc, methodIndex=90, 
    paramCount=0, params=0xbfffbb94) at xptcinvoke_unixish_x86.cpp:153
#52 0x40d928a6 in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libxpconnect.so
#53 0x40d9b287 in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libxpconnect.so
#54 0x4009f85b in ?? () from /export2/dp/trunk/mozilla/dist/bin/./libmozjs.so
#55 0x400aed42 in ?? () from /export2/dp/trunk/mozilla/dist/bin/./libmozjs.so
#56 0x4009f8d8 in ?? () from /export2/dp/trunk/mozilla/dist/bin/./libmozjs.so
#57 0x4009fc4f in ?? () from /export2/dp/trunk/mozilla/dist/bin/./libmozjs.so
#58 0x4006e66d in ?? () from /export2/dp/trunk/mozilla/dist/bin/./libmozjs.so
#59 0x41b5130d in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libjsdom.so
#60 0x41b947d5 in ?? ()
   from /export2/dp/trunk/mozilla/dist/bin/components/libjsdom.so
#61 0x416e8035 in nsXBLPrototypeHandler::ExecuteHandler (this=0x8825dc0, 
    aReceiver=0x424e30d8, aEvent=0x41983fc8) at nsXBLPrototypeHandler.cpp:442
#62 0x416eb921 in nsXBLFocusHandler::Focus (this=0x424c3620, aEvent=0x41983fc8)
    at nsXBLFocusHandler.cpp:103
#63 0x41508a34 in nsEventListenerManager::HandleEvent (this=0x4247e148, 
    aPresContext=0x422f3f30, aEvent=0xbfffdf44, aDOMEvent=0xbfffdc80, 
    aCurrentTarget=0x424e30d8, aFlags=7, aEventStatus=0xbfffdf90)
    at nsEventListenerManager.cpp:1698
#64 0x4165f18c in nsXULElement::HandleDOMEvent (this=0x424e30d0, 
    aPresContext=0x422f3f30, aEvent=0xbfffdf44, aDOMEvent=0xbfffdc80, 
    aFlags=1, aEventStatus=0xbfffdf90) at nsXULElement.cpp:3426
#65 0x4151ca5e in nsEventStateManager::SendFocusBlur (this=0x424004d8, 
    aPresContext=0x422f3f30, aContent=0x424e30d0)
    at nsEventStateManager.cpp:3611
#66 0x41519eb9 in nsEventStateManager::SetContentState (this=0x424004d8, 
    aContent=0x424e30d0, aState=2) at nsEventStateManager.cpp:3306
#67 0x4166449b in nsXULElement::SetFocus (this=0x424e30d0, 
    aPresContext=0x422f3f30) at nsXULElement.cpp:4534
#68 0x41663c6b in nsXULElement::Focus (this=0x424e30d0)
    at nsXULElement.cpp:4439

Comment 16

[Suresh Duddi (gone)]

Looks like the fix would be to delay figuring out if paste should be highlighted
or not up until absolutely required - On popup of the menu. I think the menu in
question is the "cut, copy, paste" menu that shows up when we right click on a
text window. Over to editor folks.

Comment 17

[Akkana Peck]

If we aren't doing that now, then my guess is that this would require a
reworking of the command handling system.  Simon, are you still the command
handling guru?  If not, who is?  Is it possible to delay checking for paste
until a menu containing that command is popped up?  (Of course, this assumes
there's no toolbar with the command on it, though there's an RFE against the
editor requesting a toolbar paste button.  If nothing else, this would help the
browser window's startup time.)

Comment 18

[Simon Fraser [no longer active]]

0.9.9

Comment 19

[Simon Fraser [no longer active]]

Over to 1.0

Comment 20

[scottputterman]

Moving Netscape owned 0.9.9 and 1.0 bugs that don't have an nsbeta1, nsbeta1+,
topembed, topembed+, Mozilla0.9.9+ or Mozilla1.0+ keyword.  Please send any
questions or feedback about this to [e-mail].  You can search for
"Moving bugs not scheduled for a project" to quickly delete this bugmail.

Comment 21

[Michael Gabriel]

please look at bug 56219, comment #42 and the supplied patch
i cant evalute it myself
this needs a new milestone btw 

Comment 22

[Boris Zbarsky [:bzbarsky]]

Is this still an issue?

Comment 23

[Takanori MATSUURA]

nsClipboard::FindSelectionNotifyEvent does not exist in current m-c.