On Sat, 26 Feb 2005 15:46:29 +0530, BAIN <[EMAIL PROTECTED]> wrote: > > i am using vmalloc for allocating memory in my kernel module . i read > > about a article poking fun at the usage of vmalloc .. i want > > dynamically allocated mem but am not doing something in IRQ or DMA > > mode so using vmalloc ... my current kernel number is 2.4.27. any > > suggestions on using vmalloc. [ i am using this allocation mostly in > > a kthread which is created in 1:1 ratio per request kthread per > > request since the processing in a bit long ] > > > > should i not really use vmalloc ..... please tell !!!! > If you don't need the physicalyl contigeous memory, eg. for DMA (IRQ > won't need contigeous memory ) or for performace reasons then its > prerfectly ok to use vmalloc. Why would you think that it should not > be done. As far as kerenel memory space is concerned the region will > be in consequetive addresses except that it may not be cosequetive in > the pyhsical memory. Also the L3 cache might benifit from physically > contigeous acccesses other than a need for dma. So if you are > processing large bufferes then you may consider using kmalloc instead. > vmalloc in general will have more chance of succeeding in case of > memory contention. > For more info you can refer to a very well stated discussion in Linux > Device Drivers 2nd Edition by Roubinni. (Google LDD and you should get > a link). > > > Also i want more info on work queues , ( better way to write bh's ) > > and some pointer that shows how to use them ... > > > Again a very good discussion about that can be found in above book > > Cheers >
I will recommend a book, called Linux Kernel development by Robert Love, which covers kernel 2.6. Work queues are added after kernel 2.4. http://rlove.org/kernel_book/index.html > -- > BAIN > http://abhijit.adotout.net > -- > -- ----- KD. http://www.geocities.com/kirandivekar/ -- ______________________________________________________________________ Pune GNU/Linux Users Group Mailing List: (plug-mail@plug.org.in) List Information: http://plug.org.in/mailing-list/listinfo/plug-mail Send 'help' to [EMAIL PROTECTED] for mailing instructions.
