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Message-ID: <4cbd01f40510170959l30f90bc1k@mail.gmail.com>
Date: Tue, 18 Oct 2005 01:59:21 +0900
From: Sangwoo Shim <sangwoos@gmail.com>
To: kamal kc <kamal_ckk@yahoo.com>
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References: <20051017120734.GA820@taran.infoua.com.ua>
	<20051017122657.58723.qmail@web35703.mail.mud.yahoo.com>
Cc: freebsd-net@freebsd.org, freebsd-hackers@freebsd.org
Subject: Re: malloc() in kernel and increasing mbuf and cluster size
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2005/10/17, kamal kc <kamal_ckk@yahoo.com>:
> > > sys/malloc.h has function prototypes for malloc()
> > > kern/kern_malloc.c defines the malloc()
> > >
> > > the malloc() definition is
> > >
> > > void *
> > > malloc(size, type, flags)
> > >     unsigned long size;
> > >     struct malloc_type *type;
> > >     int flags;
> > >
> > > i understand the size and flags but what shall i
> > > do with the malloc_type.
> >
> > man 9 malloc :-)
> >
>
> i saw the man pages.
>
> it says to use malloc_type via
>
> MALLOC_DEFINE(type,shortdesc,longdesc)
> MALLOC_DECLARE(type)
>
> the man pages use M_FOOBUF(where did it come from ??)
> in the field type.
>
> Now how should i code it.
>
> struct malloc_type  mytype;
> mytype=3DMALLOC_DEFINE(.....,"mybuffers","mybuffers");
>
> what should i put in the type field ??
>
> thanks in advance,
> kamal
malloc type is defined for some kind of statistics/trackings.
If you define some specific malloc types for your module/driver etc., you
can track the memory usage more accurately. For example, if you do vmstat -=
m
you can see how much memories are used for specific allocations by looking
at type field.

Regards,
Sangwoo Shim

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