Date: Sat, 28 Apr 2012 23:17:03 +0300 From: Aleksandr Rybalko <ray@dlink.ua> To: Jason Evans <jasone@FreeBSD.org> Cc: current@freebsd.org Subject: Re: <jemalloc>: jemalloc_arena.c:182: Failed assertion: "p[i] == 0" Message-ID: <20120428231703.374bc042.ray@dlink.ua> In-Reply-To: <C8857CA7-44D5-4EB0-A1E2-DE0E0F6A673E@FreeBSD.org> References: <20120421185402.GH1743@albert.catwhisker.org> <7AD8956D-AD18-4CAB-9953-06E00185A7DA@freebsd.org> <20120428150941.e0464900.ray@dlink.ua> <C8857CA7-44D5-4EB0-A1E2-DE0E0F6A673E@FreeBSD.org>
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On Sat, 28 Apr 2012 11:29:01 -0700
Jason Evans <jasone@FreeBSD.org> wrote:
> On Apr 28, 2012, at 5:09 AM, Aleksandr Rybalko wrote:
> >>> On Apr 21, 2012, at 11:54 AM, David Wolfskill wrote:
> >>>>
> >>>> But contrib/jemalloc/src/arena.c contains a function,
> >>>> arena_chunk_validate_zeroed():
> >>>>
> >>>> 175 static inline void
> >>>> 176 arena_chunk_validate_zeroed(arena_chunk_t *chunk, size_t
> >>>> run_ind) 177 {
> >>>> 178 size_t i;
> >>>> 179 UNUSED size_t *p = (size_t *)((uintptr_t)chunk +
> >>>> (run_ind << LG_PAGE)); 180
> >>>> 181 for (i = 0; i < PAGE / sizeof(size_t); i++)
> >>>> 182 assert(p[i] == 0);
> >>>> 183 }
> >
> > maybe it somehow related to low count of free memory, because I see
> > that very frequently on my box. (Atheros AR7242 mips32be with 32M of
> > RAM)
> >
> > After "#ifdef" of that function body, box behave good (seems) :)
>
> Yes, arena_chunk_validate_zeroed() (which is debug-only code) has the
> side effect of faulting in untouched pages, so it potentially
> increases physical memory usage. In practice, this sanity checking
> has saved jemalloc from regressions that would otherwise manifest as
> mysterious application memory corruption (and would have prevented
> even more regressions, had it existed earlier). You can disable it
> and many other performance-sacrificing debug features by defining
> MALLOC_PRODUCTION in /etc/make.conf.
Yeah, found it. Thank you.
It is possible to hide such debug code under debug macro, so embedded
guys will be more happy about sizes? :)
Thank you for that big job!
>
> Jason_______________________________________________
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--
Aleksandr Rybalko <ray@dlink.ua>
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