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KernelTrap Interviews Andrea Arcangeli

An anonymous reader writes "Andrea Arcangeli completely rewrote the 2.4 Linux kernel virtual memory subsystem several years ago, a surprising event during the evolution of a stable kernel series. A very intelligent 27-year-old from Italy, Andrea spoke with KernelTrap in great detail about the past, present and future of his Linux kernel efforts. An interesting interview ."

41 of 145 comments (clear)

  1. Surprise by gowen · · Score: 5, Funny

    Linux hacker : Age 27 : lives with in parents house.

    Who'd've thunk it, eh?

    --
    Athletic Scholarships to universities make as much sense as academic scholarships to sports teams.
    1. Re:Surprise by nathanhart · · Score: 5, Funny

      Hey the rents cheap, the foods free and only once or twice a day you have to answer one of their computer questions

      --
      GeekLeak.com - Silly name, serious geeks
    2. Re:Surprise by millahtime · · Score: 2, Funny

      My bad. I didn't RTFA. So, that's a nice way of saying he is in the attic.

    3. Re:Surprise by KarmaPolice · · Score: 5, Informative

      Linux hacker : Age 27 : lives with in parents house.

      Who'd've thunk it, eh?

      Actually, most italian men live with their parents until they get married.

    4. Re:Surprise by CharAznable · · Score: 5, Insightful

      In many countries, it's customary to live with your parents until you get married and move away. That's how it is in Costa Rica, where I'm from. I wouldn't be surprised that Italy is the same way, them being so family oriented.

      --
      The perfect sig is a lot like silence, only louder
    5. Re:Surprise by Zerbey · · Score: 2, Informative

      I think my parents gave up trying to understand what I was doing on the computer within a couple of weeks of me owning one.

      I just got the occasional "Isn't it just amazing what they can do nowadays?" after that...

      Most non-Geek parents are the same, I think.

    6. Re:Surprise by Anonymous Coward · · Score: 2, Funny

      Actually, most italian men live with their parents until they get married.
      Considering the fact that he spends his life re-writing kernels then I think he's going to be living at home until he's finished re-writing 2.8 as well.

    7. Re:Surprise by hackrobat · · Score: 2, Informative

      Well, in India, it is customary to live with your parents even after you get married. It has to do with family values, esp. in rural India. In the big cities, it has more to do with the fact that the cost of living by yourself is prohibitively high for most people. Software engineers are an exception. ;)

    8. Re:Surprise by Anonymous Coward · · Score: 2, Funny

      Judging from the code coming out of India, I'm guessing it's customary to marry your parents.

    9. Re:Surprise by Kozar_The_Malignant · · Score: 2, Informative

      >Age 27 : lives with in parents house.

      This is very, very common in Italy. 60 Minutes (I think) did a piece on it a few years ago. Profiled a 40ish executive, single, who lived with the parents. Goes home for lunch, mom does his laundry, etc. This in a guy making serious bucks (well, Lira, anyway). The article pointed out that this is a common way of life until they get married.
      --
      Some mornings it's hardly worth chewing through the restraints to get out of bed.
    10. Re:Surprise by gowen · · Score: 2, Funny
      This is very, very common in Italy.
      I know, they're called Mammoni ("mother's boys").

      But it was a good line, and I couldn't resist...
      --
      Athletic Scholarships to universities make as much sense as academic scholarships to sports teams.
    11. Re:Surprise by mpecatam · · Score: 2, Funny

      "Actually, most italian men live with their parents until they get married."

      Or even after they get married. The idea is to live in your parents house until you can live in your childrens house.

    12. Re:Surprise by cluckshot · · Score: 4, Insightful

      It just isn't the same in the USA as the rest of the world. Generally the rest of the world expects kids to stay at home until they marry. The compressed locations of Europe and Asia tend to make this most practical. They also have a real good social order that tends to respect the idea that family is very important.

      The USA grew up with people who had really moved out (to another country) and also with lots of space. As such we tend to view it as a requirement to move out. I think in many ways the Non US way is superior in human terms. It does have its price. The US way has its own advantages.

      --
      Never Politically Correct ~ I prefer the facts If you don't like what I say, get a life, or comment yourself.
    13. Re:Surprise by TyrranzzX · · Score: 2, Interesting

      It's kinda wierd, the old countries like the middle east, it's custom for an entire family to live in the same house generation after generation. I had a teacher who's family lived in a house for 800 years. The boon to that system is that the grandparents and great grandparents get to see their kids and educate them about their childhood every day. Tradition stays and sticks.

      Then in Europe, there's different expectations. Either you move out when you marry or you move out when you have to financially. Depends on the culture.

      Here in america, it's usually you goto school for 18 years, then college and at college either you stay at home or at a dorm. Then, you move into your own place. There are people who are smart enough to move out when they're 18 or 19. Hell, back in the early 1900's it was customary for kids to stay at home until they married.

      The only advantage to the american way is freedom from tradition. I kinda think that it's bad that way myself, considering the fact we've got girls who are pregnant as young as 14 or 15 around here.

  2. Nice to see some recognition for kernel devs. by Henrik+S.+Hansen · · Score: 4, Insightful

    Very nice to see some recognition for the kernel developers and other Free Software developers.

    To me, they really are some sort of modern day heroes.

    1. Re:Nice to see some recognition for kernel devs. by mumblestheclown · · Score: 3, Insightful
      "Dear linux developers: you won't get any of our money, and you will still live in your parents' basement, but to us, and we say this from our hearts, you are true heroes. For you and your naivete are what turns Gulfstream IVs into Gulfstream Vs, Mercedes into Maybachs, and 'beach view' into 'beach front.'"

      The CEOs of IBM, RedHat, Sony, and every other company on the bandwagon that you are working for for free.


      just because you mark this 'troll' doesn't make it any less true

    2. Re:Nice to see some recognition for kernel devs. by tanguyr · · Score: 4, Interesting

      The subject of this interview works for, and is paid by, SUSE - which belongs to Novell: When I started working for SUSE I was still attending University but over time I got more interested about the work I was doing on linux, plus I could make a living thanks to linux while I didn't get any money by studying more years at University ;).

      Your pov is a pretty common misconception: big business profiting from the work of hundreds of thousands of idealistic but naive developpers. The truth of the matter is that big business wants - needs - enterprise features in open source software, and you're going to get there a heck of a lot faster by paying somebody to develop them than you are waiting for some guy to decide that he personally *really needs* to support 32 parallel processors.

      --
      #!/usr/bin/english
    3. Re:Nice to see some recognition for kernel devs. by mumblestheclown · · Score: 2
      Bullshit.

      There is SOME inevitable blowback from the commercial world to OSS, but most large companies very carefully isolate the OSS parts to give back as ltitle as possible or make meaningless OSS contributions. Look! Sony's OSS'd some kernel hardware interface that enables communication with an embedded sony controller! if you just build your own chip foundry and reverse engineer sony's chips you can save on software costs!

      Oh lookie! Red Hat open sources everything except the proprietary bits that actually give their software market value.

      Oh lookie! IBM uses linux, but its most important software (DB2) .. well.. no, not quite.

      and here you are being happy about the crumbs they throw back to OSS. I'd like to sell you real estate.

  3. Amazing considering no education above high school by drizst+'n+drat · · Score: 4, Insightful

    Andrea Arcangeli: I've no degree yet, the only piece of paper I have is the high school diploma. I wasn't that bad at school, for instance I surprisingly got 60/60 votation in the diploma and maximal votes at University too for all the software related exams, and I loved studying physics and electronics too (not only computers). It always amazes me when people, without formal education, can accomplish so much. I've seen a lot of this with folks to receive their backgrounds from non-traditional sources such as Computer Learning Center and the like.

  4. Re:Amazing considering no education above high sch by Anonymous Coward · · Score: 3, Insightful

    It always amazes me when people, without formal education, can accomplish so much.

    It always amazes me how stupidly ignorant white-boy can seem to be about his fantastic education system and how it seems you can't do 'anything' in the world without a certificate from some organized education front ...

    Please. "Higher Education" is fine and dandy, but it is a luxury that many people, striving hard to survive and live another day, just simply cannot afford.

    Many times, striving hard to educate oneself is simply far, far superior than "working hard to get educated by someone else"...

    It sickens me how much people rely on 'modern education systems' for their personal enhancement. Personal enhancement is not something you can only get at school ... and nor is education.

    Life is School. But school is not life!

  5. Re:Amazing considering no education above high sch by wombatmobile · · Score: 3, Funny

    It always amazes me when people, without formal education, can accomplish so much.

    Yeah, mostly high achievers graduate from Yale and Harvard first and then distinguish themselves by serving their country selflessly before going on to make the world a better, safer place.
  6. RTFA by Nuclear+Elephant · · Score: 5, Funny

    Andrea spoke with KernelTrap in great detail about the past, present and future of his Linux kernel efforts.

    Sorry, looks like she's a he. I was really hoping it would turn out to be a chick - chicks that can rewrite Linux components are extremely sexy.

    1. Re:RTFA by sfhc · · Score: 3, Funny

      LOL. This reminds me of one time where I had to make a phone call to a new vendor where the contact name was Andrea. It was a software company, so we figured it was pretty cool that we got to talk to a woman that is at least somewhat tech-savvy. Me and the guys in the office spend the morning fantasizing about the 'hot' woman that we were about to talk to. How surprised we were when the male voice at the other end identified itself as Andrea! He was an Italian that had moved here to the states. Considering all the things that we had been saying about Andrea we all just about fell out of our chairs in disgust! Ya never know who's behind the name!

    2. Re:RTFA by matt-fu · · Score: 3, Funny
      chicks that can rewrite Linux components are extremely sexy

      Well, at least until they reject your request for a kernel modification because they "have a headache".

  7. Higher education yes, degree no by Anonymous Coward · · Score: 5, Informative

    He has higher education, he just doesn't have the degree. The article indicates that he learned a great deal from his college courses.

    A degree gets you an interview. What you learned gets you the job. AA skipped the interview step ;-)

  8. EEK! by NicolaiBSD · · Score: 5, Funny
    The parallel port was the device I knew best in the PC hardware because for the final exam at high school we developed an autorange (from a few millivolt to thousand of volts) digital oscilloscope (designing both hardware and software) and I was acquiring the data from the 8 bits output of the ADC using the parallel port in nibble mode with a multiplexer with x86 inline assembler in a C++ program.

    If you understand this sentence you know you're a geek.

    1. Re:EEK! by KJE · · Score: 5, Informative

      When I read this all I could think of was that I wish I had gone to his highschool.

    2. Re:EEK! by Lemmeoutada+Collecti · · Score: 4, Informative

      Using the Paralell port with an ADC is actually fairly easy. You just connect the input to a neutral grounded source to prevent circuit noise, feed the input from the analog waveform source (a calibrated RF generator works nicely) and adjust the capacitance to normalize the digital output. Use the multiplexer to allow more than one input to be sampled, and code the assembly to sample nibbles in a round robin based on the matched timing of the data strobe from the ADC. Using the paralell port results in stepping of the data, as the maximum resolution of the scope is limited by the 8 bits of the port. However, with multiplexing, some of the multiplexed channels can be used to widen the bit count to 16, 24, or 32. I never tried it above 32, as the 8086 I was using was unable to sample fast enough beyond that, even in assembly. Process the port input as a large integer and convert that to a pixel position (and numeric readout if desired) in simple integer to fixed point math.

      The hardest part is eliminating the circuit noise for millivolt readings. In larger waveforms (5v and higher) the noise is mostly drowned, but at the millivolt range, any circuit noise, or any unmatched grounding, causes jitters in the waveform being read. Calibration to the range is essential for any serious reading.

      And for fun, hook an unamplified output from a portable CD player to the scope, and viola, instant waveform display of the sound signal. Great way to relax on a lazy sunday, listen to and watch the music. Of course, this was in the pre winamp days, so it was a Walkman.

      [/Meandering off]

      --

      You can have it fast, accurate, or pretty. Pick any 2.
    3. Re:EEK! by Etyenne · · Score: 2, Funny
      If you understand this sentence you know you're a geek.

      Perfectly clear. Which part don't you understand ?

      j/k

      --
      :wq
  9. That Sheila's a he! by RoloDMonkey · · Score: 5, Funny

    Poor Andrea, now he is going to get slashdotted by a bunch of lonely geeks that didn't RTFA, and think that he is a she.

    --
    Long live the Speaker Bracelet
    Rolo D. Monkey
  10. Maybe Andrea would fix PCIPCI DMA for us? by Anonymous Coward · · Score: 3, Interesting
    On modern CompactPCI hardware I should be able to DMA between (for instance) SCSI and a DSP array on the PCI bus.

    Currently this isn't possible. For our application we had to make a very nasty hack to our SCSI driver.

    What we would have liked to do would have been something like:

    Get physical address from libpci

    mmap region to user process

    open a rawio device

    read()/write() the rawio device to-from the mmap()'d buffers to effect DMA transfers directly to the PCI device.

    In our case (a streaming media server) we have no need whatsoever to bring the disk buffers into main memory.

    Programmed transfers from main memory to PCI memory are expensive.

  11. hm by Anonymous Coward · · Score: 4, Funny

    after reading that article i feel as though my programming skills are on par with a primate.

  12. Re:Amazing considering no education above high sch by shawn(at)fsu · · Score: 2, Insightful

    These posts make it seem like people who do get a degree from a higher education source are some how doomed to fail.

    IMHO the reason you hear about people like Bill Gates is because they are the exception not the rule. It's a story of success over odds and people love that stuff, gives 'em hope.

    What about all the advances made by people who did get a higher education. How many advanced medical procedures come out of some college dropout that was working in his parents basement.

    Do you need to go to college to be successful, no. Does it help, yes.

    I got the job with the company I work for because I had a degree, granted did any of the information I learned in my Java classes help me when I got here, not really, but my internship sure did. The degree just got me in the door. If I can't perform, I'm out.

    I don't think that I am worse off because I got a degree, I don't think people who don't have a degree either. The goal is still the same it's just that the path will be a little different.

    --
    500 dollar reward for tip(s) leading to the arrest of the person(s) who stole my sig.
  13. Mod Parent Up by sonpal · · Score: 5, Insightful
    Andrea did some cool stuff. How come our high schools don't teach us how to:

    Live off the land

    Modify our cars

    Hack computers

    Understand personal finance

    Write contracts

    Defend ourselves in court

    Defend ourselves physically

    Handle a gun safely

    Think critically

    Change our government for the better

    It seems to me that too much focus is given to understanding the past and not enough to understanding the present. Don't get me wrong, knowing the past is valuable, but I think that if we teach people about the present, people are naturally going to be interested in the past.

    In general, people don't need to know how to calculate the area under a curve. But everyone needs to know how to think critically and not be manipulated.

    1. Re:Mod Parent Up by dylan_- · · Score: 2, Insightful
      Andrea did some cool stuff. How come our high schools don't teach us how to:
      I suspect the problem is that people expect schools to teach them everything. Most of the useful things I've learned in life weren't learnt in school...
      --
      Igor Presnyakov stole my hat
    2. Re:Mod Parent Up by CAIMLAS · · Score: 2, Insightful

      Too much about the past, are you kidding me?

      The high school my siblings graduated from only offered one history class, and it was an optional class only available to seniors.

      How is that too much history?

      If anything, schools are not teaching enough anything. They're simply going through the motions of 'education'. You're absolutely right in what schools should be teaching, though.

      --
      ~/ssh slashdot.org ssh: connect to host slashdot.org port 22: too many beers
  14. Andrea likes TCPA by swillden · · Score: 4, Interesting

    I found this bit really interesting (and insightful, actually, more on that below):

    Actually in my spare time I had an idea of one revolutionary and ambitious project I can build on top of the trusted computing capable hardware (that project has nothing to do with linux by the way, but for it to run on linux too, linux would need to provide some basic trusted computing support), that's something I wanted to build for a long time but it has never been feasible until they added the trusted computing to the hardware and they filled the gap to make my idea possible, so I'm quite happy about these new hardware features (despite clearly they can be misused for some annoying things too).

    I bring it up because this is so contrary to the common opinion on /., which is that TCPA is unabashedly evil and has no utility. Andrea is obviously one very smart guy, and a person who feels the need to have complete control over his machine, but who likes TCPA in spite of the risk of misuse. Contradiction?

    The fact is that TCPA *is* an extremely useful and valuable technology for systems that require a high degree of security. It's not clear to me that the average home PC benefits from it, but it's very valuable for cheap, high-performance key management systems and cryptographic accelerators, systems that contain valuable data (like many businessmen's laptops), and systems at critical points in network infrastructure. I'm sure there are other valuable, and non rights-eroding, applications as well.

    In my work as a designer and developer of high-security systems, I'm extremely excited about the fact that we can now buy low-end computing equipment that has TCP hardware. It enables so much. The next step is TCP hardware that is tamper-resistant, or even tamper-reactive, but still cheap. For now, really high-security systems still require something better, but TCPA can fill the niche between systems that require serious security and those that can get by with purely software-based security (or no security, which is fine for the majority of desktops and laptops).

    To be clear, DRM is a bad idea, in general. The business applications (self-destructing documents, confidential documents that cannot be printed) do have potential utility, but I doubt they're worth the complexity they'll create. And Palladium aka NGSCB aka whatever-it's-called-today is an unquestionably evil notion, focused on removing the ability of people to control their own hardware, in an effort to allow a couple of declining business models to prop one another up.

    IMO, what geek activists need to focus on is not killing the development of tools like TCPA, but rather on legal and social means of ensuring our rights.

    Tools are not evil. Only users are evil.

    --
    Note to ACs: I usually delete AC replies without reading them. If you want to talk to me, log in.
    1. Re:Andrea likes TCPA by swillden · · Score: 2, Interesting

      I don't see what hardware can do that software cannot.

      Hardware can keep keys and policies secure. Although general-purpose computing hardware is perfectly capable of performing cryptographic operations and executing security decisions, there is no way to prevent an attacker from getting hold of the keys used or subverting the decisions made.

      As an example, suppose you're a bank, and you need to encrypt transactions that you exchange with other banks. These transactions are worth hundreds of millions of dollars per day. If he encryption keys were to be revealed to an attacker, he could bribe someone at the telco that manages the leased data lines and modify the data as it moves across the line. Or, more subtly, if he could just read the data as it flows by, he could learn who is paying money to whom, and then exploit this information.

      So, how do you secure those encryption keys? If you put them in any sort of general-purpose computer, an employee with access to the machine can get them out. In fact, if you ever "put them in" anywhere, that implies that at some point they were "out", where people could potentially see them (and copy them!). And with security issues of this sort there is no single individual anywhere that is sufficiently trustworthy... even if you can find someone who you know is perfectly honest, you have no way to be sure someone can't torture the information out of them or otherwise coerce them.

      The answer is secure hardware. You generate the keys within secure hardware that is running special, non-modifiable software that will refuse to *ever* divulge those keys, except in a secure fashion (encrypted with key encryption keys that meet certain criteria, or in parts, etc.). In this way it's possible for the keys to be created, managed, used and destroyed without any possibility that anyone can ever get hold of them.

      That's one example, there are many others. How to encrypt the data on your laptop hard drive securely, for example.

      --
      Note to ACs: I usually delete AC replies without reading them. If you want to talk to me, log in.
  15. Canadian schools cover all this by IncohereD · · Score: 3, Interesting

    Andrea did some cool stuff. How come our high schools don't teach us how to:
    # Live off the land


    If your high school is in a (sub/)urban area, how useful is this? Or possible?

    # Modify our cars

    My high school had auto courses (my school was in Southern Ontario, Canada)

    # Hack computers

    I took 4 or 5 computer courses in high school. Basic application use, programming in Turing and C++, graphics in 3D Studio, large projects.

    # Understand personal finance

    I believe there were business courses along these lines, I didn't take any, though. I think this was also covered in the general stream of math.

    # Write contracts
    # Defend ourselves in court


    We had grade 12 and 13 law. I'm not sure how much time was given to contracts (I only took half of the grade 12 course), but we even went on a visit to court in both mandatory grade 10 history and optional grade 12 law.

    # Defend ourselves physically

    In grade 9 gym we covered wrestling. The upper gym courses covered more defense.

    # Handle a gun safely

    Not really a big deal in Canada. I know a lot of people who learned this in cadets or the reserves, though.

    # Change our government for the better

    History (Canadian, Ancient, American, 20th Century), Politics, Law...all covered this. Your comment about understanding the past rather than the present is missing the point entirely. But we did always talk about current elections in classes, even in elementary school.

    # Think critically
    In general, people don't need to know how to calculate the area under a curve. But everyone needs to know how to think critically and not be manipulated.


    Doesn't calculating the area under a curve require critical thinking?? Regardless, Calculus wasn't taught till grade 13, and anything past grade 10 math was optional. If you're school taught you anything at all you probably learned to think critically. Didn't you have to write essays? Solve problems? Every single one of our grade 13 classes had an "independent study unit" which we had to do something on our own, requiring critical thinking.

    We even covered media bias in our english classes (I didn't take the full english media class, but we did cover it in the required grade 13 english class). We took stories and advertisements from different newspapers and looked at their political bias. Then we watched some Chomsky videos.

    As far as I can tell most Americans seem to need to move to Canada to actually get their American values.

  16. Beware the slippery slope! by John+Harrison · · Score: 2, Informative
    That is great that you are a fan of TCPA. But its existence could lead to other things down the line.

    Once it is widespread some evil corporation might try to influence the government to mandate that it be present in all computer hardware sold in the USA. While this in itself wouldn't be bad, it is just a hop, skip and a jump from mandating something such as Palladium and full DRM on all computers, since the trusted hardware will already be there!

    If you don't think it could happen just look at recent bad legislation such as the DMCA and the Mickey Mouse Protection Act. Now imagine both the entertainment lobby and some of the software lobby bearing down on congress. Are your senators going to stand up to them? Mine won't.

    Tools might not be evil, but Disney and MS are.

  17. My how he has come along in 8 years... by ZombieEngineer · · Score: 4, Interesting
    A bit of background history for the parport driver. This original started by two guys (Philip Blundell and Tim Waugh) blabbering about treating the parallel port as bus. There was something like ten e-mails for a couple of days while most of the regulars were scratching their heads.

    The parallel port ZIP drive maintainer asked them to provide a function prototype of this thing that they were talking about, of them (Phil/Tim) quickly whipped up a rough 50 line C header file which was turned into a working parport driver + parport enabled ZIP and printer driver (removing the infamous "printer-on-fire" message in the process). There were bugs in the parport driver (it was the first pass but you could print and use the ZIP drive together which was something that previously could not be done) but Phil/Tim/Andrea quickly pounced on the driver and straighten it out. Some of the routines for supporting NatSemi and SMC chipsets are there due to the ZIP drive maintainer not being able to use EPP mode on his Dell desktop.

    When Andrea first appeared on the parallel port scene he was lacking a little confidence (appologising for his poor english which was far better than my italian :-) but once he got his feet wet with kernel hacking there was nothing stopping him.

    Unfortunately I dropped out of the parallel port group around 2000 due to work commitments (linux hacking was one of those phases that I went through).

    I congratulate Andrea on where his life has taken him.

    ZombieEngineer

    Formerly-the-hacker-who-maintained-linux-zip-drive rs.