From: Konstantin Osipov <kostja@tarantool.org> To: tarantool-patches@freelists.org Cc: gorcunov@gmail.com, vdavydov.dev@gmail.com Subject: Re: [tarantool-patches] [rfc 3/4] core/fiber: Put static watermark into stack to track its usage Date: Tue, 5 Mar 2019 11:08:13 +0300 [thread overview] Message-ID: <20190305080813.GJ21955@chai> (raw) In-Reply-To: <20190302130034.050488016@gmail.com> * Cyrill Gorcunov <gorcunov@gmail.com> [19/03/03 23:25]: > We want to detect a situation where task in fiber is too eager for > stack and close to its exhausting. For this sake upon stack creation > we put 8 marks on last stack page with step of 128 bytes. Such params > allows us to fill ~1/4 of a page, which does seem reasonable but > we might change this params with time. > > Since the watermark position is permanent and some task is close > to stack limit we print about the situation once to not spam > a user much and stop putting the mark on recycling. > + /* > + * Initially we arm last page of a stack > + * to catch if we're getting close to > + * stack exhausting. > + */ > + if (stack_direction < 0) > + fiber->stack_wmark_ofl = fiber->stack; > + else > + fiber->stack_wmark_ofl = fiber->stack + fiber->stack_size - page_size; > + stack_put_wmark(fiber->stack_wmark_ofl); > +} Could you please incorporate some randomness when assigning this address? A simple pseudo-random number within range 0 ..page_size/2 would make me happy. -- Konstantin Osipov, Moscow, Russia, +7 903 626 22 32 http://tarantool.io - www.twitter.com/kostja_osipov
next prev parent reply other threads:[~2019-03-05 8:08 UTC|newest] Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-03-02 12:55 [rfc 0/4] fiber/stack: Increase stack size and shrink rss usage Cyrill Gorcunov 2019-03-02 12:55 ` [rfc 1/4] core/fiber: Increase default stack size Cyrill Gorcunov 2019-03-02 12:55 ` [rfc 2/4] core/fiber: Mark stack as unneeded on creation Cyrill Gorcunov 2019-03-02 12:55 ` [rfc 3/4] core/fiber: Put static watermark into stack to track its usage Cyrill Gorcunov 2019-03-05 8:08 ` Konstantin Osipov [this message] 2019-03-05 8:17 ` [tarantool-patches] " Cyrill Gorcunov 2019-03-05 8:10 ` Konstantin Osipov 2019-03-05 8:14 ` Cyrill Gorcunov 2019-03-05 19:17 ` Cyrill Gorcunov 2019-03-05 8:20 ` Konstantin Osipov 2019-03-05 8:27 ` Cyrill Gorcunov 2019-03-02 12:55 ` [rfc 4/4] core/fiber: Shrink stack when recycling Cyrill Gorcunov 2019-03-05 8:30 ` [tarantool-patches] " Konstantin Osipov 2019-03-05 8:41 ` Cyrill Gorcunov 2019-03-05 9:32 ` [tarantool-patches] " Konstantin Osipov
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