Cheng, That's perfect. Thanks
On Thu, Jan 17, 2019, 11:51 PM Shao, Cheng <[email protected] wrote: > Hi, > > I believe it's mentioned here: > > > https://ghc.haskell.org/trac/ghc/wiki/Commentary/Rts/Storage/GC/RememberedSets > > Regards, > Shao Cheng > > On Fri, Jan 18, 2019, 12:34 PM chessai . <[email protected]> wrote: > >> Ryan, >> >> That makes perfect sense, thanks. Is that documented explicitly anywhere? >> If not, I'd like to add the documentation to any place relevant. >> >> Thanks >> >> On Thu, Jan 17, 2019, 8:19 PM Ryan Yates <[email protected] wrote: >> >>> Hi, >>> >>> Because GHC's GC is generational it needs a way to handle heap objects >>> from older generations that point into younger generations. This only >>> happens when an older object is mutated to point to a younger object. GHC >>> solves this by invoking the GC write barrier (not to be confused with write >>> barriers for memory synchronization) `dirty_MUT_VAR`. This will add that >>> mutable object to a mutable list that will be traversed in minor GCs along >>> with young generation roots. Additionally the write barrier will mark the >>> heap object as "dirty" to avoid adding it to the list more than once. >>> >>> Ryan >>> >>> On Thu, Jan 17, 2019 at 4:29 PM chessai . <[email protected]> wrote: >>> >>>> Devs, >>>> >>>> I've heard from a few friends that MutVars, TVars, etc. are more >>>> challenging for the garbage collector. I'm writing to ask if someone can >>>> answer: 1. Is this true, and 2: Why? I can't seem to find anything like a >>>> writeup or documentation that mentions this. The HeapObjects trac page also >>>> mentions nothing about these supposed difficulties that GC faces with >>>> mutable heap objects. >>>> >>>> Thanks >>>> _______________________________________________ >>>> ghc-devs mailing list >>>> [email protected] >>>> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs >>>> >>> _______________________________________________ >> ghc-devs mailing list >> [email protected] >> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs >> >
_______________________________________________ ghc-devs mailing list [email protected] http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
