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<h1 id="csce-410">CSCE 410</h1>
<h1 id="history-1-1">history (1-1)</h1>
<ul>
<li>1st gen
<ul>
<li>single user writes program that operates entire computer and manages all hardware
<ul>
<li>TODO? no development except right at the computer?</li>
</ul></li>
<li>no need for relocatable code
<ul>
<li>drivers and such were per-machine? TODO</li>
</ul></li>
</ul></li>
<li>2nd gen
<ul>
<li>move programming off-line (no longer programming in production?)</li>
<li>automated program loading by special monitor program
<ul>
<li>batch programming, but only one program kept in memory at a time</li>
</ul></li>
<li>misbehaving programs could mess with monitor, or other programs though</li>
</ul></li>
<li>3rd gen
<ul>
<li>scheduling of user programs to allow other stuff to happen while one program is waiting for IO
<ul>
<li>time sharing</li>
</ul></li>
<li>created need for time sharing</li>
<li>time sharing brought need for and development of
<ul>
<li>passwords</li>
<li>filesystems</li>
<li>interleaved execution of multiple programs (process scheduling)</li>
<li>remote access (computing as a utility)</li>
<li>virtual memory</li>
</ul></li>
</ul></li>
<li>what is an OS
<ul>
<li>OS controls and coordinates physical resources</li>
<li>abstracts various hardware details
<ul>
<li>IO, networking, processes</li>
</ul></li>
<li>keeps computer efficient
<ul>
<li>scheduling</li>
</ul></li>
</ul></li>
</ul>
<h1 id="architectural-support-1-2">architectural support (1-2)</h1>
<ul>
<li>OSes need hardware to do: asynchronous events, hardware protection (of other processes), address spaces, timers</li>
<li>asynchronous events
<ul>
<li>(nearly) all asynchronous events are handled using interrupts
<ul>
<li>IO, user input, timers, etc...</li>
</ul></li>
<li>when an interrupt happens the CPU does:
<ul>
<li>stop current execution</li>
<li>save state (registers and flags and stuff)</li>
<li>changes to supervisor mode (privileged mode)</li>
<li>branches to predefined location (interrupt handler corresponding to interrupt, in interrupt vector table (IVT))</li>
</ul></li>
<li>return from interrupt (<code>rti</code>) instruction automatically restores state</li>
<li>interrupt can be caused by
<ul>
<li>an asynchronous event (hardware, timer, error)</li>
<li>software (system call)</li>
</ul></li>
</ul></li>
<li>hardware protection
<ul>
<li>some instructions are marked as supervisor-mode-only, so regular user programs can't use them
<ul>
<li>OS then exposes that functionality using system calls</li>
</ul></li>
<li>memory is segmented (base+limit), so user programs can't access out of their bounds
<ul>
<li>also virtual memory allows multiple programs to have the same virtual addresses, but be in different physical memory locations</li>
</ul></li>
<li>hardware-provided timers allow OS to regain control from user programs at a regular interval
<ul>
<li>needed for reliable scheduling</li>
</ul></li>
</ul></li>
</ul>
<h1 id="os-structure-1-3">OS structure (1-3)</h1>
<ul>
<li>onion view of OS
<ul>
<li>view kernel as layered like an onion</li>
<li>innermost layer is lowest level hardware handling code</li>
<li>outermost layer is user programs</li>
<li>each layer can't be any closer to core than it is, due to dependencies on lower layers</li>
<li>from inside to out: hardware, memory, process manger, process coordinator, IPC, RTC, device manager, networking, filesystem, user programs</li>
<li>monolithic</li>
</ul></li>
<li>layering, monolithic kernels
<ul>
<li>monolithic kernel has layers that are all in kernel space and all equally trusted and important</li>
<li>layers are hierarchical</li>
</ul></li>
<li>microkernel
<ul>
<li>kernel has only very most core parts of OS</li>
<li>other stuff (like filesystems, scheduling...) is in user space server processes</li>
<li>more overhead because of context switching</li>
<li>benefits
<ul>
<li>server processes could be in different machines, communicating over a network (distributed system)</li>
<li>portable: kernel is easier to port because kernel core is smaller</li>
<li>robust: server process can fail without crashing the whole kernel</li>
</ul></li>
</ul></li>
<li>exokernel
<ul>
<li>do not abstract/emulate hardware, instead, export hardware securely</li>
<li>library operating system
<ul>
<li>used by apps to abstract the hardware</li>
</ul></li>
</ul></li>
</ul>
<h1 id="system-calls-1-4">system calls (1-4)</h1>
<ul>
<li>skipped</li>
</ul>
<h1 id="interrupts-and-exceptions-9-1-5">interrupts and exceptions (9, 1-5)</h1>
<ul>
<li>hardware interrupts
<ul>
<li>usually some kind of I/O: keyboard input, HDD ready, etc...</li>
</ul></li>
<li>there's an interrupt for periodic hardware timer
<ul>
<li>allows kernel to recover control from user program periodically</li>
</ul></li>
<li>exception: interrupt due to an error
<ul>
<li>may have an error code associated with it</li>
</ul></li>
<li>interrupt descriptor table (IDT)
<ul>
<li>256 elements large</li>
<li>first 32 entries are for exceptions</li>
<li>hardware interrupts can then map to any other interrupt using PIC</li>
</ul></li>
<li>handling interrupt
<ul>
<li>save sate of the calling program</li>
<li>handle interrupt</li>
<li>restore calling program state, return with <code>iret</code></li>
</ul></li>
<li>typical interrupt handling is to have the IDT just be stubs that just push to stack the type of interrupt and call common handling code
<ul>
<li>in our MPs, that common handling code then calls virtual methods of proper handling class</li>
<li>reduces code bloat?</li>
</ul></li>
<li>interrupts are prioritized (somehow)
<ul>
<li>if a higher priority interrupt comes in while handling a lower priority one, the lower priority interrupt is interrupted by the higher priority one</li>
<li>for equal priority, it's FIFO</li>
</ul></li>
<li>8259 programmable interrupt controller (PIC)
<ul>
<li>just need to know that this exists, and is necessary for handling interrupts</li>
</ul></li>
</ul>
<h1 id="allocation-2-1">allocation (2-1)</h1>
<ul>
<li>need to allocate space for:
<ul>
<li>new process (<code>fork()</code>)</li>
<li>new program (<code>execve()</code>)</li>
<li>process stack grows</li>
<li>process expands heap (<code>malloc()</code>)</li>
<li>process creates (attaches to) shared memory(<code>shmat()</code>)</li>
</ul></li>
<li>external vs internal fragmentation
<ul>
<li>external: OS needs to allocate a contiguous block of frames but there is no single contiguous space big enough</li>
<li>internal: you need a specific amount of memory, but maybe you have to round up to a multiple of page size. The difference between needed and what it takes up is internal fragmentation?</li>
</ul></li>
<li>naive allocator
<ul>
<li>TODO is a slab allocator a naive allocator?</li>
<li>TODO</li>
</ul></li>
<li>buddy allocator
<ul>
<li>maintain free lists in power-of-2 sizes</li>
<li>allocate:
<ul>
<li>round up size to next power of 2</li>
<li>lookup in free list of that size</li>
<li>if available, return</li>
<li>if that free list is empty, split a block from the next size up into 2 blocks and repeat
<ul>
<li>may need to split more than one size larger</li>
</ul></li>
</ul></li>
<li>deallocation
<ul>
<li>put back into free list</li>
<li>check buddy (flip bit in offset). if buddy is also free, join the blocks
<ul>
<li>may need to join more than one size larger</li>
</ul></li>
</ul></li>
</ul></li>
<li>different allocators:
<ul>
<li><code>malloc()</code>: virtually contiguous, size in bytes, implemented in user level library</li>
<li><code>kmalloc()</code>: physically contiguous, bytes, kernel, slab allocator</li>
<li><code>vmalloc()</code>: virtually contiguous, bytes, kernel, slab allocator</li>
<li><code>alloc_pages()</code>, <code>__get_free_pages()</code>: contiguous frames/pages, kernel, buddy allocator</li>
</ul></li>
</ul>
<h1 id="paging-7-2-3-8-2-4">paging (7, 2-3) (8, 2-4)</h1>
<ul>
<li>page size:
<ul>
<li>large pages => more fragmentation</li>
<li>small pages => more overhead</li>
</ul></li>
<li>paging allows for address spaces</li>
<li>page table lookup in hardware
<ul>
<li>MMU hardware</li>
<li>hardware uses top few bits of address as index into page table</li>
<li>then get that entry from the page table, add the lower bits of the virtual address (the offset), and go there in memory</li>
</ul></li>
<li>multi-level
<ul>
<li>split the virtual address into multiple indexes</li>
<li>this way you have a hierarchy of page tables, so all page tables below the top level can be lazily allocated
<ul>
<li>saves memory (reduces overhead)</li>
</ul></li>
<li>page table level <span class="math inline">\(n\)</span> at index contains physical address of the page table <span class="math inline">\(n+1\)</span> for use with <span class="math inline">\(n+1\)</span>th index</li>
</ul></li>
<li>inverted
<ul>
<li>linear array indexed by frame number</li>
<li>one table per entire system</li>
<li>maps frame number to (PID, page number)</li>
<li>saves space because there is always exactly one entry per physical frame</li>
<li>very slow because you have to search the entire thing for the PID and virtual address you're looking for</li>
<li>also you cannot have shared memory between processes</li>
</ul></li>
<li>hash page tables
<ul>
<li>one per system</li>
<li>indexed by (PID, page number)</li>
<li>typically collisions are handled with chaining</li>
<li>scales well with physical memory</li>
<li>does not allow for shared memory?</li>
</ul></li>
</ul>
<h1 id="segmentation-10-2-6">segmentation (10, 2-6)</h1>
<ul>
<li>segments are logical for programming (code, data, stack, heap)
<ul>
<li>stuff in segment is semantically related</li>
</ul></li>
<li>segmentation allows for easy data sharing between processes
<ul>
<li>e.g. forked process or shared dynamic library</li>
</ul></li>
<li>can lead to more external fragmentation because segments are larger than pages</li>
<li>segmented paging:
<ul>
<li>split virtual address into segment number, page number, and offset</li>
<li>reduces fragmentation</li>
</ul></li>
</ul>
<h1 id="tlb">TLB</h1>
<ul>
<li>translation look-aside buffer</li>
<li>caches page table lookups</li>
<li>you must clear entries when
<ul>
<li>pages are freed/unmapped</li>
<li>context switch happens</li>
</ul></li>
<li>in x86, it is managed by hardware</li>
<li>indexed by page table number and page table index
<ul>
<li>e.g. just 20 bits, not by the full address</li>
</ul></li>
<li>parameters
<ul>
<li>size</li>
<li>lookup latency</li>
<li>miss penalty (depends on MMU and memory speed)</li>
<li>target miss rate (depends on application)</li>
</ul></li>
<li>MIPS software managed TLB
<ul>
<li>TLB is the only cache</li>
<li>filling the TLB is done in software</li>
<li>TLB miss triggers special TLB refill exception</li>
</ul></li>
</ul>
<h1 id="page-replacement-policies-15-2-10">page replacement policies (15, 2-10)</h1>
<ul>
<li>cost of page fault, or effective memory access time (ema)
<ul>
<li>ema = (1-p) * ma + p * PageFaultTime</li>
<li>p = probability of a page fault</li>
<li>ma = memory access time</li>
</ul></li>
<li>locality of reference
<ul>
<li>if a program references location <span class="math inline">\(n\)</span>, it is likely to reference <span class="math inline">\(n\)</span> and locations near <span class="math inline">\(n\)</span> in the near future</li>
</ul></li>
<li>when you need more memory, how do you decide which pages to evict (and possibly writ to disk)?</li>
<li>FIFO
<ul>
<li>just evict the page that has been in memory the longest</li>
<li>pro: simple</li>
<li>con: does not exploit principle of locality of reference (assumes that pages resident in memory longer are more likely to continue to be referenced)</li>
</ul></li>
<li>ideal
<ul>
<li>evict page that will be next used farthest in the future (if at all)</li>
<li>pro: proven lowest number of page faults</li>
<li>con: impossible to implement in real life because we cannot see the future</li>
</ul></li>
<li>least recently used (LRU)
<ul>
<li>evict the page that has not been accessed in the longest period of time</li>
<li>pro: good performance</li>
<li>con: difficult to implement (must keep track of all references)</li>
<li>must keep chronological history of page references
<ul>
<li>software: use a stack</li>
<li>hardware: charge a capacitor and let it slowly drain</li>
</ul></li>
</ul></li>
<li>2nd chance
<ul>
<li>approximation to LRU</li>
<li>have a use bit for each page, and keep a pointer to the next candidate victim page
<ul>
<li>use bit is set every time frame is referenced</li>
<li>when a frame is newly loaded, use bit starts at 1</li>
</ul></li>
<li>when reclaiming memory:
<ul>
<li>if pointed-to page has use bit 0: use that frame as victim, and increment pointer to next frame</li>
<li>if pointed-to page has use bit 1: set that use bit to 0, increment pointer, and start over</li>
</ul></li>
<li>when victim pointer reaches end of memory, wrap it around to the beginning</li>
<li>if all frames have use bit 1, you will end up looping through all of them (and setting use bit 0 each time), and finally selecting the one that was pointed to at first</li>
</ul></li>
<li>2nd chance enhanced
<ul>
<li>also track dirty bit
<ul>
<li>dirty bit is only set when frame is written to (and thus the frame is dirty)</li>
</ul></li>
<li>also keep track of dirty frames separately, because we sometimes clear dirty bit in algorithm</li>
<li>choice at each step (bits are u,d)
<ul>
<li><table>
<thead>
<tr class="header">
<th>use, dirty</th>
<th>next</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>1,1</td>
<td>0,1</td>
</tr>
<tr class="even">
<td>1,0</td>
<td>0,0</td>
</tr>
<tr class="odd">
<td>0,1</td>
<td>0,0*</td>
</tr>
<tr class="even">
<td>0,0</td>
<td>select as victim</td>
</tr>
</tbody>
</table></li>
<li>when going from 0,1 => 0,0* , you must list that page in the external dirty frames list, because it's still dirty, but it is now not indicated in bits</li>
</ul></li>
<li>the choice steps (above) mean that a dirty page will not be selected as victim until passed over twice
<ul>
<li>this is desirable because dirty frames incur a higher eviction penalty (they must be written to disk)</li>
</ul></li>
</ul></li>
</ul>
<h1 id="working-set-2-11">working set (2-11)</h1>
<ul>
<li>AKA resident set? TODO I think it's a little different</li>
<li>ideal resident set size changes dynamically as program runs
<ul>
<li>but we assume working set is constant</li>
</ul></li>
<li>all pages referenced within a specified time delta
<ul>
<li>because the process doesn't need all of it's pages at once</li>
</ul></li>
<li>rule
<ol style="list-style-type: decimal">
<li>at each reference, working set is determined, and only pages in virtual set are kept in memory</li>
<li>a program can only run if it's entire current resident set is in memory</li>
</ol></li>
<li>note: if all you reference is one page, working set eventually becomes only that page</li>
<li>removing frames
<ul>
<li>remove any frames last referenced longer than (time delta) time ago</li>
<li>victims are not overwritten immediately, instead are put into one of two lists:</li>
<li>free frame list
<ul>
<li>for clean frames (non-dirty) (frames that are ok to overwrite, as they are in sync with the swap)</li>
<li>OS can freely pick frames from here and use them</li>
</ul></li>
<li>modified frame list
<ul>
<li>dirty frames</li>
<li>periodically write these frames to disk, and then move them to the free frame list</li>
</ul></li>
</ul></li>
<li>when a frame not in the current working set is referenced, first check the free frame list and modified frame list
<ul>
<li>if the frame exists in either of those, you can simply reclaim it</li>
</ul></li>
<li>victims:
<ul>
<li>when looking for a victim, first get from free frame list
<ul>
<li>if free frame list is non-empty, just pick one and use it</li>
</ul></li>
<li>if free frame list is empty
<ul>
<li>pick from modified list, <strong>but write it to disk first</strong></li>
</ul></li>
</ul></li>
<li>case study: solaris page buffering
<ul>
<li>TODO do we need to know this?</li>
</ul></li>
<li>demand paging: TODO is this the same as working set?</li>
<li>demand paging on less sophisticated hardware
<ul>
<li>for when you don't have a hardware-managed valid bit?</li>
</ul></li>
</ul>
<h1 id="recursive-paging-17-2-12">recursive paging (17, 2-12)</h1>
<ul>
<li>in x86</li>
<li>allows you to modify page directory and page table entries without mapping them into virtual memory</li>
<li>set the last entry of the page directory to the physical address of the page directory</li>
<li>access <code>n</code>th entry of page directory: use address <code>| 1023 | 1023 | n | 00 |</code>
<ul>
<li><code>1023</code> and <code>n</code> are both 10 bits</li>
</ul></li>
<li>access <code>a</code>th entry of <code>b</code>th page table: use address <code>| 1023 | b | a | 00 |</code>
<ul>
<li><code>1023</code>, <code>a</code>, and <code>b</code> are all 10 bits</li>
</ul></li>
</ul>
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