Date: Mon, 22 Sep 2014 11:19:05 +0800 (CST) From: btw@mail.ustc.edu.cn To: "Konstantin Belousov" <kostikbel@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Re: What's the difference between kmem_arena and kernel_arena? Message-ID: <5002061.890581411355945170.JavaMail.coremail@mailweb> In-Reply-To: <20140921200401.GL2210@kib.kiev.ua> References: <20140921200401.GL2210@kib.kiev.ua> <1473289.768021411196850376.JavaMail.coremail@mailweb>
next in thread | previous in thread | raw e-mail | index | archive | help
I got it! Thank you so much! ;-) -twb > -----Original E-mail----- > From: "Konstantin Belousov" <kostikbel@gmail.com> > Sent Time: 2014-9-22 4:04:01 > To: btw@mail.ustc.edu.cn > Cc: freebsd-hackers@freebsd.org > Subject: Re: What's the difference between kmem_arena and kernel_arena? > > On Sat, Sep 20, 2014 at 03:07:30PM +0800, btw@mail.ustc.edu.cn wrote: > > Hi All, > > > > There are two similar variables declared in vm/vm_kern.h, they are kernel_arena > > and kmem_arena. Both of them are used in kmem_malloc(): > > > > rv = kmem_back((vmem == kmem_arena) ? kmem_object : kernel_object, > > > > I'm wondering what's the difference between them. Why both of them are needed? > > I have done a lot of searching, but I still can not find an answer. > > Look at their usage. > > kmem_arena is used for the kernel malloc() and page-sized uma allocations. > kernel_arena is used by miscellaneous other kernel needs, e.g. for > kernel stacks of threads, as the backing for kva_alloc() etc.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?5002061.890581411355945170.JavaMail.coremail>