Are segments so bad?

By: Jukka Larja (roskakori2006.delete@this.gmail.com), January 25, 2020 8:29 am
Room: Moderated Discussions
Brendan (btrotter.delete@this.gmail.com) on January 25, 2020 1:46 am wrote:
> Jukka Larja (roskakori2006.delete@this.gmail.com) on January 24, 2020 9:42 pm wrote:
> > Brendan (btrotter.delete@this.gmail.com) on January 24, 2020 6:27 pm wrote:
> > > Jukka Larja (roskakori2006.delete@this.gmail.com) on January 23, 2020 6:36 am wrote:
> > > > Brendan (btrotter.delete@this.gmail.com) on January 22, 2020 3:28 pm wrote:
> > > > > Jukka Larja (roskakori2006.delete@this.gmail.com) on January 22, 2020 6:12 am wrote:
> > > > > > Brendan (btrotter.delete@this.gmail.com) on January 22, 2020 3:32 am wrote:
> > > > > >
> > > > > > > The right way to think about the way memory management works in Windows (unless swap is
> > > > > > > disabled by an idiot) is to think of physical memory as nothing more than a cache of the
> > > > > > > page file; where "max. virtual memory size = page file size". Physical memory size and
> > > > > > > physical memory availability are irrelevant - they have no effect on OOM whatsoever.
> > > > > >
> > > > > > No, that's not right (you may be right for some older Windows version, but I'm pretty sure even
> > > > > > 2000 didn't work like that). By default, Windows allocates very small page file, especially on a
> > > > > > system with large RAM. Like I wrote in the other post, on 64 GB system, page file was 9 GB[1].
> > > > >
> > > > > OK; my description was a little incomplete, and could've been more like "think of physical memory
> > > > > as nothing more than a cache of the page file; where "max. virtual memory size = page file size",
> > > > > and where "page file size" may not be a fixed size and may grow as needed (if possible)."
> > > > >
> > > > > I probably should've also said "swap size" instead of "page file size" to cover non-default configurations.
> > > >
> > > > Still wrong. Windows is quite happy to run with page file significantly smaller than physical memory
> > > > (running completely without page file may be stupid for unrelated reasons, of which I'm not that
> > > > familiar with). That's probably the normal mode of operation with current memory amounts.
> > >
> > > Why wrong?
> > >
> > > I'd expect that with page file significantly smaller than physical memory Windows
> > > would only commit to "max. swap"; and then the rest of the physical memory (that can't
> > > be used for "cache of swap") would be used for "cache of file data" (and anything
> > > else Windows might cache that is not part of "memory processes committed to").
> >
> > I'm not sure I understand, but if I do, I should not be able to run a program that does "malloc(15GB)"
> > on my system with 5 GB page file (that's not the case in case you're wondering).
>
> You shouldn't be able to "malloc(15GB)" on a system that can't increase the size of the
> page file up to 15+ GiB later (if/when necessary). Of course if you don't use (modify)
> all of the 15 GB you allocated it might never increase the size of the page file.

Just to be extra sure (though there really wasn't any doubt really), before I wrote my last comment I wrote a program that allocated 15 GBs, wrote it full of stuff and exited. Commit went up by 15 GBs (at the time of allocation, it wasn't increasing gradually) just as expected and page file size didn't increase, just as expected.

If you actually use Windows with normal out-of-the box settings, it is trivial to note that it doesn't work like you decribe.

> > > Note: All files (and parts of files) mapped as "read-only" wouldn't be included in
> > > "how much OS has committed to" (those area can be backed by file system not swap).
> >
> > Yes, I mentioned this earlier (our game Trine 4 maps about 14 GBs of
> > asset files on start and that doesn't add up against commit limits).
> >
> > > Oh my - I did some checking and it seems that Windows doesn't even support swap partitions
> > > (it only supports "page file on normal file system"); so it always has to worry about
> > > normal files and swap competing for the same space, can't avoid "file system meta-data"
> > > overhead, and has to worry about file fragmentation for the page file.
> >
> > Windows doesn't start with zero size page file. It starts with some relatively large one (like five GBs
> > on my 32 GB laptop, nine on that 64 GB system I mentioned earlier) and generally expects not to need
> > to increase the size. Page file persists over boots, so fragmentation is only an issue if one fragments
> > the disk before page file is create (or page file size is increased a lot on a fragmented disk).
>
> I'm more used to the old rule of thumb, which is "twice as much swap as you have RAM"
> (e.g. 64 GiB of swap on a system with 32 GiB of RAM), and your idea of "relatively large"
> (5 GiB vs. 64 GiB) sounds more like my idea of tiny (less than 10% of 64 GiB).

I believe that rule of thumb hasn't been relevant for about 20 years, but I'm not 100 % sure. Could have been changed as late as some Windows XP service pack.

For the usual usage patterns on laptops and desktops, large page file doesn't make sense. I'm a very unusual case with hundreds of tabs open in Firefox and Chrome, couple of instant messengers (each hundreds of megabytes, because of course you need a browser to make a desktop app these days), Thunderbird (working set 600 MBs), LibreOffice Calc and some smaller things. All that nets commit of about 16 GBs. With common usage patterns (mostly running one or two apps at a time, closing the browser and all tabs after each session) you're at fraction of that.

Then consider how small the SSDs are and it makes even less sense. For common usage patterns more memory means less swap space. If user does something special, then page file will grow, but it makes no sense to steal even a single gigabyte out of some 120-250 GB SSD.

> Yeah, I get the impression that the "auto-increase page file size' in Windows isn't great (I'd prefer
> swap partitions; and can't see why it doesn't make processes wait while it increases page file size
> and can't be better at leaving more of page file's disk space allocated across reboots).

I think the algorithm tries to increase page file size beforehand, but when something like 32^32 compile processes get launched during a three second window or some shader compiler just decides it needs 28 GBs for something, it's hard to keep up.

As long as I've used SSDs, I haven't actually seen the Windows warning popup on my own systems, even when page file size has been increased. I've only seen it on our build servers, which do experience those extreme cases of memory consumption increases. So maybe the page file increase algorithm is actually good enough for most users and MS just expects server people to set the size by hand.

That said, my experiment with 15 GB memory allocation pushed the total commit to bit over 34 GBs (was running Visual Studio at the time too), while the limit (currently, with that 5 GB page file still in place) is 38.

Just for science I tried allocating 25 GBs. The allocation took a long time, but there was no warning popup from Windows. The program then run quickly (it just touched every 2048th byte in allocation) and quit. To my surprise, the page file was now 8 GBs. I run the program again and monitored page file more closely. It was actually 16 GBs during program run but was immediately (within a second or two) reduced to 8 GBs after the run.

So it seems Windows is actually pretty good in this runtime page file resizing. Not sure whether that's because the SSD in this laptop is quite a bit faster than anything in our servers or if there's been some recent change in how the size increases are handled.

Out of interest, I also tried larger allocations. 75 GB one failed, even though there would have been about 13 GBs free space on disk after appropriate page file size increase. 70 GB one worked, and system commit went to about 90 GBs as expected.

Since that was so fun, I decided to try allocating that 70 GBs 2 kBs at a time. It went fine close to the end. I was monitoring the page file size with dir /Ahs and. It was gradually being increased (in rather small increments) until I got: "Ei riittävästi muistiresursseja komennon käsittelyä varten."

(That's "not enough memory resources to handle the command") and after another try simply "Out of memory." (no more localization, eh?). At that point, screen went black (not sure what crashed), Visual Studio crashed, Firefox crashed, Thunderbird crashed, Process Explorer crashed and something called "Dell Client Management Service" crashed too (seen in Event Viewer. I don't even know what that is). And I still didn't get that popup from Windows, though according to Event Viewer, there was an Application Popup with the familiar text in it. Maybe it crashed too.

Nice detail about Firefox: I didn't lose any of the text I had written here so far.

> > As for "avoiding file system meta-data", why wouldn't Windows be able to do that?
> > It's not like NTFS needs to be aware of what goes on inside a page file.
>
> When the OS wants to access data at "offset in page file" it'd have to convert that into "offset
> in partition" (while taking into account page file fragmentation, etc) instead of just doing
> a fast/simple addition ("offset in partition = start of partition + offset in swap").

Each fragment could be treated as separate page file. And why use offset in partition instead of offset on disk (if such optimization really makes any difference).

> Also; increasing the page file size would involve finding free blocks of disk space and marking
> them as "not free" in whatever NTFS uses to keep track, then adding them to whatever NTFS uses
> to keep track of which parts of a disk are used by a file, plus updating the directory entry
> (e.g. file size field) and any other accountancy/statistics (e.g. free space stats).

You talk like the paging system needs to do all that without help from NTFS. It's not like MS needs to even support a page file on every file system, for example, on ReFS it's not supported.

It's also pretty uncommon to need to increase page file size.

> My main problem with "page file" is what happens when you reach an "almost full" state - it creates a bizarre/unintuitive
> relationship where (e.g.) allocating memory reduces the space you have left for files, and creating files
> reduces how much memory you can allocate. Of course this problem goes away if you have a fixed size page
> file, but then what's the point of not having a fixed size swap partition instead?

With file, you can decide later. You can also change the fixed size later. From my point of view, the question is why have any more partitions than necessary at all? Partitions are unflexible. I have a Linux box with 10 GB swap partition and 32 GBs of memory, because that computer started with just 8 and resizing partition is too much work for me. It's likely to be 10 + 64 or 10 + 128 in the future, when I update the hardware and just clone the disk or use it as is.

> There'd also be work-arounds in various utilities (doing a back-up of the file system?
> Better add a special case to avoid backing up the page file. Trying to restore from a
> checkpoint? Better not try to restore the old page file. Want to search for all files
> modified in the last 20 minutes? Better hide the page file in the search results.)

If you want to backup Windows, or any OS for that matter, I'm sure there's more than one file to exclude. Why would restoring old page file be a problem anyway (unless you are talking about restoring over running system, which doesn't really make sense in this context, if you have any idea about how Windows works)?

> Then there's things like RAID and whole disk encryption (do you really want "RAID-5" and encryption
> for your page file, just because you did want those things for normal files on "C:/"?).

No idea what Windows does with RAID 5 page file. No idea if your C: can be RAID 5 in Windows either. As for encryption, you'll probably want (all) your page file(s) encrypted, if you decide system drive encryption is your thing.

> I think ReadyBoost was to improve latency for normal files (especially
> during boot where OS is trying to fetch all drivers, GUI, etc).

I thought it worked for page file too, but I could be wrong. It hasn't been relevant since 2011 for me.

-JLarja
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                    It's hard to separateDavid Hess2020/01/09 09:37 AM
                      It's hard to separatenone2020/01/09 10:34 AM
                  Are segments so bad?Paul A. Clayton2020/01/09 03:15 PM
                    Yes, they are terrible (NT)Anon2020/01/09 03:20 PM
                    Are segments so bad?Adrian2020/01/10 12:49 AM
                      Are segments so bad?Etienne2020/01/10 02:28 AM
                        Are segments so bad?gallier22020/01/10 02:37 AM
                          Are segments so bad?Adrian2020/01/10 03:19 AM
                            Are segments so bad?Adrian2020/01/10 04:27 AM
                              Are segments so bad?Etienne2020/01/10 04:41 AM
                        Are segments so bad?Adrian2020/01/10 03:05 AM
                          Are segments so bad?gallier22020/01/10 03:13 AM
                      Are segments so bad?Anon32020/01/10 11:37 AM
                        Are segments so bad?Adrian2020/01/10 11:47 AM
                          Are segments so bad?Brendan2020/01/11 01:43 AM
                      Are segments so bad?Anon2020/01/10 06:51 PM
                        Are segments so bad?Adrian2020/01/11 01:05 AM
                          Are segments so bad?Jukka Larja2020/01/11 08:20 AM
                            Are segments so bad?Brendan2020/01/11 10:14 AM
                              Are segments so bad?Jukka Larja2020/01/11 09:15 PM
                                Are segments so bad?Brendan2020/01/11 11:15 PM
                                  Are segments so bad?Jukka Larja2020/01/12 04:18 AM
                                  Are segments so bad?anon2020/01/12 12:30 PM
                                    Are segments so bad?Brendan2020/01/12 10:19 PM
                                      the world sucks worse than you're aware ofMichael S2020/01/13 01:50 AM
                                        the world sucks worse than you're aware ofBrendan2020/01/13 03:56 AM
                                        the world sucks worse than you're aware ofGabriele Svelto2020/01/13 04:46 AM
                                      Are segments so bad?Jukka Larja2020/01/13 07:41 AM
                                        Are segments so bad?Brendan2020/01/13 08:21 AM
                                          Are segments so bad?Jukka Larja2020/01/13 09:43 AM
                                            Are segments so bad?Brendan2020/01/13 01:02 PM
                                              Are segments so bad?Anne O. Nymous2020/01/13 01:22 PM
                                                Are segments so bad?Brendan2020/01/13 02:50 PM
                                                  actor of around 200?Michael S2020/01/14 03:58 AM
                                                  Not overcomitting leads to more OOMs, not lessGabriele Svelto2020/01/14 12:50 PM
                                                    Not overcomitting leads to more OOMs, not lessBrendan2020/01/14 01:40 PM
                                                      Not overcomitting leads to more OOMs, not lessGabriele Svelto2020/01/15 03:17 AM
                                                        Not overcomitting leads to more OOMs, not lessAnon2020/01/15 04:43 AM
                                                          Not overcomitting leads to more OOMs, not lessGabriele Svelto2020/01/15 05:09 AM
                                                            Not overcomitting leads to more OOMs, not lessAnon2020/01/15 05:16 AM
                                                              Not overcomitting leads to more OOMs, not lessGabriele Svelto2020/01/15 06:58 AM
                                                                Not overcomitting leads to more OOMs, not lessAnon2020/01/15 09:08 AM
                                                                  Not overcomitting leads to more OOMs, not lessGabriele Svelto2020/01/16 04:05 AM
                                                        Not overcomitting leads to more OOMs, not lessMichael S2020/01/15 04:48 AM
                                                          Not overcomitting leads to more OOMs, not lessGabriele Svelto2020/01/15 05:10 AM
                                                            Not overcomitting leads to more OOMs, not lessMichael S2020/01/15 08:13 AM
                                                              Not overcomitting leads to more OOMs, not lessJukka Larja2020/01/15 08:46 AM
                                                        Not overcomitting leads to more OOMs, not lessJukka Larja2020/01/15 06:08 AM
                                                          Thanks for the info (NT)Gabriele Svelto2020/01/15 07:00 AM
                                                      Not overcomitting leads to more OOMs, not lessLinus Torvalds2020/01/15 12:30 PM
                                                        OOM killer complainsAnon2020/01/15 12:44 PM
                                                          OOM killer complainsanon2020/01/15 04:26 PM
                                                        Not overcomitting leads to more OOMs, not lessBrendan2020/01/16 07:26 AM
                                                          Not overcomitting leads to more OOMs, not lessLinus Torvalds2020/01/16 10:17 AM
                                                            Not overcomitting leads to more OOMs, not lessLinus Torvalds2020/01/16 10:48 AM
                                                              Not overcomitting leads to more OOMs, not lessDoug S2020/01/16 03:41 PM
                                                                Not overcomitting leads to more OOMs, not lessDoug S2020/01/16 03:44 PM
                                                Are segments so bad?rwessel2020/01/13 04:11 PM
                                              Are segments so bad?Jukka Larja2020/01/14 07:37 AM
                                                Are segments so bad?Brendan2020/01/14 08:48 AM
                                                  Are segments so bad?Jukka Larja2020/01/14 11:13 AM
                                                    Are segments so bad?Brendan2020/01/14 02:30 PM
                                                      Are segments so bad?Brett2020/01/14 10:13 PM
                                                      Are segments so bad?Jukka Larja2020/01/15 07:04 AM
                                                  Are segments so bad?Gabriele Svelto2020/01/15 03:35 AM
                                            Specifying cost of dropping pagesPaul A. Clayton2020/01/13 03:00 PM
                                              Specifying cost of dropping pagesrwessel2020/01/13 04:19 PM
                                                Specifying cost of dropping pagesGabriele Svelto2020/01/15 03:23 AM
                                          Are segments so bad?anon2020/01/14 02:15 AM
                                            Are segments so bad?Brendan2020/01/14 06:13 AM
                                          Are segments so bad?Gabriele Svelto2020/01/14 12:57 PM
                                            Are segments so bad?Brendan2020/01/14 02:58 PM
                                              Are segments so bad?Gabriele Svelto2020/01/15 03:33 AM
                                                Are segments so bad?Anon2020/01/15 05:24 AM
                                                  Are segments so bad?Jukka Larja2020/01/15 06:20 AM
                                                Are segments so bad?Etienne2020/01/15 05:56 AM
                                                  Are segments so bad?Jukka Larja2020/01/15 08:53 AM
                                                    Are segments so bad?Gabriele Svelto2020/01/16 06:12 AM
                                                      Are segments so bad?Jukka Larja2020/01/16 10:56 AM
                                                Are segments so bad?Brendan2020/01/15 06:20 AM
                                                  Are segments so bad?Gabriele Svelto2020/01/15 06:56 AM
                                                    Are segments so bad?Brendan2020/01/16 07:16 AM
                                                      Are segments so bad?Jukka Larja2020/01/16 11:08 AM
                                                        Are segments so bad?Brendan2020/01/17 01:52 PM
                                                          Are segments so bad?Jukka Larja2020/01/17 10:08 PM
                                                            Are segments so bad?Brendan2020/01/18 12:40 PM
                                                              Are segments so bad?Jukka Larja2020/01/18 10:13 PM
                                                                Are segments so bad?Brendan2020/01/19 12:25 PM
                                                                  Are segments so bad?Brett2020/01/19 03:18 PM
                                                                    Are segments so bad?Brett2020/01/19 03:34 PM
                                                                  Are segments so bad?Gabriele Svelto2020/01/20 12:57 AM
                                                                  Are segments so bad?Jukka Larja2020/01/20 05:54 AM
                                                                    Are segments so bad?Brendan2020/01/20 12:43 PM
                                                                      Are segments so bad?Jukka Larja2020/01/21 07:01 AM
                                                                        Are segments so bad?Brendan2020/01/21 06:04 PM
                                                                          Are segments so bad?Jukka Larja2020/01/22 07:30 AM
                                                                            Are segments so bad?Brendan2020/01/22 03:56 PM
                                                                              Are segments so bad?Jukka Larja2020/01/23 08:44 AM
                                                      Are segments so bad?rwessel2020/01/16 03:06 PM
                                                      Are segments so bad?Gabriele Svelto2020/01/16 03:13 PM
                                                        Are segments so bad?Brendan2020/01/17 01:51 PM
                                                          Are segments so bad?Gabriele Svelto2020/01/17 03:18 PM
                                                            Are segments so bad?Anon2020/01/17 08:01 PM
                                                              Are segments so bad?Gabriele Svelto2020/01/20 01:06 AM
                                                            Are segments so bad?Brendan2020/01/18 03:15 PM
                                                              Are segments so bad?Gabriele Svelto2020/01/20 12:55 AM
                                                                Are segments so bad?Michael S2020/01/20 05:30 AM
                                                                  Are segments so bad?Gabriele Svelto2020/01/20 08:02 AM
                                                                    Are segments so bad?Jukka Larja2020/01/20 08:41 AM
                                                                    Are segments so bad?Michael S2020/01/20 08:45 AM
                                                                      Are segments so bad?Gabriele Svelto2020/01/20 09:36 AM
                                                                Are segments so bad?Brendan2020/01/20 11:04 AM
                                                                  Are segments so bad?Michael S2020/01/20 01:22 PM
                                                                    Are segments so bad?Brendan2020/01/20 02:38 PM
                                                                      Are segments so bad?Simon Farnsworth2020/01/20 03:40 PM
                                                                        Are segments so bad?Anon2020/01/20 04:35 PM
                                                                          Are segments so bad?Simon Farnsworth2020/01/20 05:30 PM
                                                                      Are segments so bad?Michael S2020/01/20 05:20 PM
                                                                  Are segments so bad?Gabriele Svelto2020/01/21 05:08 AM
                                                                    Are segments so bad?Brendan2020/01/21 06:07 PM
                                                                      Are segments so bad?Gabriele Svelto2020/01/22 01:53 AM
                                                                        Are segments so bad?Brendan2020/01/22 04:32 AM
                                                                          Are segments so bad?Jukka Larja2020/01/22 07:12 AM
                                                                            Are segments so bad?Brendan2020/01/22 04:28 PM
                                                                              Are segments so bad?Jukka Larja2020/01/23 07:36 AM
                                                                                Are segments so bad?Brendan2020/01/24 07:27 PM
                                                                                  Are segments so bad?Jukka Larja2020/01/24 10:42 PM
                                                                                    Are segments so bad?Brendan2020/01/25 02:46 AM
                                                                                      Are segments so bad?Jukka Larja2020/01/25 08:29 AM
                                                                                        Are segments so bad?Brendan2020/01/26 11:17 PM
                                                                                          Are segments so bad?Jukka Larja2020/01/27 07:55 AM
                                                                                            Are segments so bad?Gabriele Svelto2020/01/27 04:33 PM
                                                                                              Are segments so bad?Jukka Larja2020/01/28 06:28 AM
                                                                                                DDS assets and MipMap chainsMontaray Jack2020/01/29 03:26 AM
                                                                                      Are segments so bad?gallier22020/01/27 03:58 AM
                                                                                        Are segments so bad?Jukka Larja2020/01/27 06:19 AM
                                                                                  Are segments so bad?Anne O. Nymous2020/01/25 03:23 AM
                                                                            Are segments so bad?Anon2020/01/22 05:52 PM
                                                                              Are segments so bad?Anne O. Nymous2020/01/23 01:24 AM
                                                                                Are segments so bad?Anon2020/01/23 05:24 PM
                                                                                  Are segments so bad?Anne O. Nymous2020/01/24 12:43 AM
                                                                                    Are segments so bad?Anon2020/01/24 04:04 AM
                                                                                      Are segments so bad?Etienne2020/01/24 06:10 AM
                                                                              Are segments so bad?Gabriele Svelto2020/01/23 01:48 AM
                                                                                Are segments so bad?Michael S2020/01/23 03:48 AM
                                                                                Are segments so bad?Jukka Larja2020/01/23 07:38 AM
                                                                                  Are segments so bad?Gabriele Svelto2020/01/23 01:29 PM
                                                                                    Are segments so bad?Anon2020/01/23 06:08 PM
                                                                                      Are segments so bad?Jukka Larja2020/01/24 09:51 PM
                                                                                Are segments so bad?Anon2020/01/23 06:02 PM
                                                                                  Are segments so bad?Gabriele Svelto2020/01/24 03:57 AM
                                                                                    Are segments so bad?Anon2020/01/24 04:17 AM
                                                                                      Are segments so bad?Gabriele Svelto2020/01/24 09:23 AM
                                                                                        Are segments so bad?Anon2020/02/02 10:15 PM
                                                                                          Are segments so bad?Gabriele Svelto2020/02/03 01:47 AM
                                                                                            Are segments so bad?Anon2020/02/03 02:34 AM
                                                                                              Are segments so bad?Gabriele Svelto2020/02/03 05:36 AM
                                                                                                Are segments so bad?Anon32020/02/03 08:47 AM
                                                                                                Are segments so bad?Anon2020/02/04 05:49 PM
                                                                                  Are segments so bad?Jukka Larja2020/01/24 10:10 PM
                                                          Are segments so bad?Jukka Larja2020/01/17 10:26 PM
                                Are segments so bad?Anne O. Nymous2020/01/12 04:18 AM
                                  Are segments so bad?Jukka Larja2020/01/12 08:41 AM
                            Are segments so bad?rwessel2020/01/11 01:31 PM
                          Are segments so bad?Anne O. Nymous2020/01/11 08:22 AM
                      Are segments so bad?Ricardo B2020/01/11 08:01 PM
                        Are segments so bad?Adrian2020/01/12 12:18 AM
                          Are segments so bad?Michael S2020/01/12 02:43 AM
                            Are segments so bad?Adrian2020/01/12 04:35 AM
                          Are segments so bad?Ricardo B2020/01/12 12:04 PM
                            Are segments so bad?Anon32020/01/12 05:52 PM
                            Are segments so bad?Brendan2020/01/12 09:58 PM
                      Are segments so bad?Paul A. Clayton2020/01/13 09:11 AM
        No nuances, just buggy code (was: related to Spinlock implementation and the Linux Scheduler)rainstared2020/01/06 01:43 AM
          No nuances, just buggy code (was: related to Spinlock implementation and the Linux Scheduler)Foo_2020/01/06 05:33 AM
            No nuances, just buggy code (was: related to Spinlock implementation and the Linux Scheduler)dmcq2020/01/06 06:03 AM
            changes in contextCarlie Coats2020/01/09 09:06 AM
      No nuances, just buggy code (was: related to Spinlock implementation and the Linux Scheduler)rainstar2020/01/09 10:16 PM
        No nuances, just buggy code (was: related to Spinlock implementation and the Linux Scheduler)Montaray Jack2020/01/09 11:11 PM
    Suggested reading for the authoranon2020/01/04 11:16 PM
      Suggested reading for the authorab2020/01/05 05:15 AM
        Looking at the other side (frequency scaling)Chester2020/01/06 10:19 AM
          Looking at the other side (frequency scaling)Foo_2020/01/06 11:00 AM
          Why spinlocks were usedFoo_2020/01/06 11:06 AM
            Why spinlocks were usedJukka Larja2020/01/06 12:59 PM
            Why spinlocks were usedSimon Cooke2020/01/06 03:16 PM
            Why spinlocks were usedRizzo2020/01/07 01:18 AM
          Looking at the other side (frequency scaling)ab2020/01/07 01:14 AM
    Cross-platform codeGian-Carlo Pascutto2020/01/06 08:00 AM
      Cross-platform codeMichael S2020/01/06 09:11 AM
        Cross-platform codeGian-Carlo Pascutto2020/01/06 12:33 PM
          Cross-platform codeMichael S2020/01/06 01:59 PM
            Cross-platform codeNksingh2020/01/07 12:09 AM
              Cross-platform codeMichael S2020/01/07 02:00 AM
              SRW lock implementationMichael S2020/01/07 02:35 AM
                SRW lock implementationNksingh2020/01/09 02:17 PM
                  broken URL in Linux source codeMichael S2020/01/14 01:56 AM
                    broken URL in Linux source codeTravis Downs2020/01/14 10:14 AM
                      broken URL in Linux source codeMichael S2020/01/14 10:48 AM
                        broken URL in Linux source codeTravis Downs2020/01/14 04:43 PM
                  SRW lock implementation - url brokenMichael S2020/01/14 03:07 AM
                    SRW lock implementation - url brokenTravis Downs2020/01/14 11:06 AM
                      SRW lock implementation - url brokengpderetta2020/01/15 04:28 AM
                        SRW lock implementation - url brokenTravis Downs2020/01/15 11:16 AM
                      SRW lock implementation - url brokenLinus Torvalds2020/01/15 11:20 AM
                        SRW lock implementation - url brokenTravis Downs2020/01/15 11:35 AM
                          SRW lock implementation - url brokenLinus Torvalds2020/01/16 11:24 AM
                    SRW lock implementation - url brokenKonrad Schwarz2020/02/05 10:19 AM
                    SRW lock implementation - url brokennksingh2020/02/05 02:42 PM
      Cross-platform codeLinus Torvalds2020/01/06 01:57 PM
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