Re: a quest for a better scheduler

If we are facing these problems for "normal case" then hope the Solaris is handling it !! Amol Fabio Riccardi <[EMAIL PROTECTED]> on 04/04/2001 07:03:57 AM To: Alan Cox <[EMAIL PROTECTED]> cc: [EMAIL PROTECTED] (bcc: Amol Lad/HSS) Subject: Re: a quest for a better scheduler Alan

get_pid() : enahancement

In 2.4 kernel we now have no limit on the number of tasks running on a system (no NR_TASKS anymore)... I was just wondering on the efficiency of get_pid() implemetation... Although 'next_safe' concept in this function seems useful but I think we now need a robust PID allocator.. We can have a

Release naming conventions

well..don't fire me for asking such a stupid question... I am new to linux kernel world... I want to know the release naming conventions in linux.. I know the following... 2.1.xx --> means developmet release 2.2.xx --> means stable release... Now what 2.2.xx-pre6 or 2.2.xx-ac3 means ?? Amol

RE: random PIDs

"Heusden, Folkert van" <[EMAIL PROTECTED]> on 04/05/2001 03:45:13 PM To: [EMAIL PROTECTED] cc: [EMAIL PROTECTED] (bcc: Amol Lad/HSS) Subject: RE: random PIDs > Finished & tested my random PID kernel/fork.c:get_pid() replacement. > > This one keeps track of the last N (default is

Re: [Lse-tech] Re: a quest for a better scheduler

This concept I think is used in Solaris .. as they have dynamic loadable schedulers.. Zdenek Kabelac <[EMAIL PROTECTED]> on 04/05/2001 05:43:15 PM To: Andrea Arcangeli <[EMAIL PROTECTED]> cc:(bcc: Amol Lad/HSS) Subject: Re: [Lse-tech] Re: a quest for a better scheduler Hello J

__switch_to macro

Hi, The note above __switch_to macro in i386/kernel/process.c says that we no more use hardware context switching as some problems in recovering from saved state that is no longer valid. (I am peeking into 2.2 kernel). Now I have following questions 1) What exactly is meant by ' stale segm

Re: __switch_to macro

Jamie Lokier <[EMAIL PROTECTED]> on 04/06/2001 03:18:13 PM To: Amol Lad/HSS@HSS cc: [EMAIL PROTECTED] Subject: Re: __switch_to macro [EMAIL PROTECTED] wrote: > 1) What exactly is meant by ' stale segment register values' in the note. > 2) In the above macro, I think we recover gr

Re: Let init know user wants to shutdown

Kurt Roeckx <[EMAIL PROTECTED]> on 04/11/2001 06:16:52 AM To: Miquel van Smoorenburg <[EMAIL PROTECTED]> cc: [EMAIL PROTECTED] (bcc: Amol Lad/HSS) Subject: Re: Let init know user wants to shutdown On Wed, Apr 11, 2001 at 01:38:30AM +0200, Kurt Roeckx wrote: > On Tue, Apr 10, 2001

xtime.tv_usec update in timer interrupt

Hi, In update_wall_one_tick() function, we have following xtime.tv_usec += tick + time_adjust_step. where tick = (100 + hz/2)/hz. In systems where we have TSC why we cannot use that to update xtime.tv_usec. It should give better time estimate. and the values that are reture

Test mail.. pls ignore & delete

- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/

Re: BUG: Global FPU corruption in 2.2

Erik Paulson <[EMAIL PROTECTED]> on 04/24/2001 01:14:27 AM To: Christian Ehrhardt <[EMAIL PROTECTED]> cc: [EMAIL PROTECTED], [EMAIL PROTECTED] (bcc: Amol Lad/HSS) Subject: Re: BUG: Global FPU corruption in 2.2 On 23 Apr 2001 18:11:48 +0200, Christian Ehrhardt wrote: > On Thu, Apr

Re: BUG: Global FPU corruption in 2.2

Hi, I want to look into this problem. Its seems to be very interesting. But I was not following the thread from the beginning (and I mistakely deleted all these mails :( .. ).. I hope you won't mind answering following questions... 1) you are doing this on an MP or a uniprocessor ? 2) I wa

Re: Delay Function

Rajeev Nigam <[EMAIL PROTECTED]> on 04/24/2001 03:29:04 PM To: [EMAIL PROTECTED] cc:(bcc: Amol Lad/HSS) Subject: Delay Function What function i have to use to put a delay in a driver at kernel mode between reading from and writing to com port. Looking forward for ur help. Tha

Re: Delay Function

It may be possible that this is not the good choice... but u can try ... schedule_timeout(timeout) function see kernel/sched.c for more details about this function Amol Rajeev Nigam <[EMAIL PROTECTED]> on 04/24/2001 03:29:04 PM To: [EMAIL PROTECTED] cc:(bcc: Amol Lad/HSS) Subje

Re: BUG: Global FPU corruption in 2.2

Hi, I want to look into this problem. Its seems to be very interesting. But I was not following the thread from the beginning (and I mistakely deleted all these mails :( .. ).. I hope you won't mind answering following questions... 1) you are doing this on an MP or a uniprocessor ? 2) I

Re: Greetings!

well... the book sounds good... but... I am still thinking... what it has to do with linux kernel ?? [EMAIL PROTECTED] on 04/24/2001 04:27:56 PM To: [EMAIL PROTECTED] cc:(bcc: Amol Lad/HSS) Subject: Greetings! 1 in 6 children are victimized before the age of 16. Hello, my name

Re: Buddy System bitmaps

well... I doubt whether buddy allocator would take u to a situation where pages 0 and 2 are used and 1 and 3 are free... try reading __get_free_pages in mm/page_alloc.c [EMAIL PROTECTED] on 06/15/2001 12:39:20 AM To: [EMAIL PROTECTED] cc:(bcc: Amol Lad/HSS) Subject: Buddy System bit

freeing pagetables in vmfree_area_pages in vmalloc.c

we have in vfree --> vmfree_area_pages (calling) free_area_pmd (calling) free_area_pte (calling) free_page. The final free_page frees all the pages that are allocated to a memory region in vmalloc. Now where are we freeing pages that are allocated to page table themselves. For simplicity we can

kernel memory leak: freeing pagetables in vmfree_area_pages in vmalloc.c

I was talking about this leak 2 days back but my mail ot lost.. we have in vfree --> vmfree_area_pages (calling) free_area_pmd (calling) free_area_pte (calling) free_page. The final free_page frees all the pages that are allocated to a memory region in vmalloc. Now where are we freeing pa

Why we need LDT at all in 2.2 kernels ??

Hi, In 2.2 kernel do we really need its own LDT (not default_ldt) for every process (no mm sharing) ?? In what circumstances a process may need its own LDT ?? -- Amol - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED]

Re: kernel newbie question

Hi Xiong, you can get a lot of books on kernel internals... But my experience says... reading code is the best solutionall the intricacies can only be cleared when u hack the code btw a new "understanding the linux kernel" by O'reilly pub. can be helpful in 'code reading'. Amol

Compiling kernel

Hi, The question may sound very stupid... But I have following doubt. suppose I am making some change in sched.c and now I want to build my kernel that reflects the change.. Is there any way I can avoid answering all the questions when I do make zImage ? In short how should I compile the

kmem_cache_init ()

Hi, I was unable to understand the logic of the following sanity checks in slab.c/kmem_cache_init (). if (kmem_cache_diff(c_firstp,c_magic) != kmem_slab_diff(s_nextp,s_magic) || kmem_cache_diff(c_firstp,c_inuse) != kmem_slab_diff(s_nextp,s_inuse) || kmem_cache_offset(c_lastp) - ((unsigned