thesjg

--- Makefile-old        Sat Apr 26 00:33:36 2003
+++ Makefile    Sat Apr 26 00:32:27 2003
@@ -3,5 +3,7 @@

 PROG=  renice
 MAN=   renice.8
+DPADD= ${LIBKVM}
+LDADD= -lkvm

 .include <bsd.prog.mk

thesjg

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On update of tag create synonym

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thesjg

Samuel J. Greear
15 March 2010


    Many of the best ideas and implementations of those ideas in the realm of
computing come about when a single individual decides to sit down and create
something. It may be a new feature or entire system, or perhaps a new take on an
old idea. Perhaps popularized by Eric S. Raymond, in software engineering
parlance this is sometimes referred to as “scratching an itch” (Raymond, pars.
6-8). DragonFly BSD is a liberally licensed Unix-like operating system

thesjg

Title: 	VFS Quota's
Student: 	Samuel Greear
Abstract: 	Implement filesystem-agnostic kernel quota support and tools.
Content: 	

Name: Samuel J. Greear
Email: sjg@thesjg.com
Project title: VFS Quota's

Project goals and description:

thesjg

Title: 	Coalesce + MPSAFE kevent, select, poll and wakeup
Student: 	Samuel Greear
Abstract: 	This project aims to apply DragonFly BSD design ideals to several related key kernel subsystems in an attempt to improve kernel performance, scalability and maintainability.
Content: 	

Name: Samuel J. Greear
Email: sjg@thesjg.com

Project title: Coalesce + MPSAFE kevent, select, poll and wakeup

thesjg

[21:27] <@dillon> the current implementation is pretty bad, though it is using VOP_READ so there should be read-ahead by virtue of it going through the filesystem
[21:27] <@vsrinivas> also its mplocked.
[21:28] <@vsrinivas> actually looks not; just around the fd work.
[21:28] <@thesjg> so feel free to drop all your insight on me and i'll make note of it
[21:28] <@thesjg> but i'm not prepared to do it quite yet
[21:28] <@dillon> it shouldn't need that mplock since its holding the fp
[21:29] <@vsrinivas> ummm -- in the core loop it ssb_lock()s; 
[21:29] <@vsrinivas> tcp output needs the ssb lock also iirc to read from that queue.
[21:29] <@dillon> w/ regards to the rest I think it can pass a larger value in the ioflags it passes to VOP_READ ... figure out what the maximum sequential heuristic value is there and pass that
[21:29] <@dillon> (in the upper 16 bits.  See line 1694)

thesjg

<thesjg!~sjgirc@67-54-133-153.cust.wildblue.net> [03:10] i think we should commit an optimization for that phoronix threaded i/o tester
<thesjg!~sjgirc@67-54-133-153.cust.wildblue.net> [03:10] that just ignores about 80% of the i/o's
<thesjg!~sjgirc@67-54-133-153.cust.wildblue.net> [03:10] :-)
<dillon!~dillon@leaf.dragonflybsd.org> [03:11] we could certainly optimize buffers containing all-zeros (if we don't already). heh
<thesjg!~sjgirc@67-54-133-153.cust.wildblue.net> [03:11] that might be useful
<thesjg!~sjgirc@67-54-133-153.cust.wildblue.net> [03:11] they are probably all zero's
<thesjg!~sjgirc@67-54-133-153.cust.wildblue.net> [03:11] i looked at what it did
<thesjg!~sjgirc@67-54-133-153.cust.wildblue.net> [03:11] it just allocated a chunk ala malloc() and then wrote that allocated buffers contents to a file
<thesjg!~sjgirc@67-54-133-153.cust.wildblue.net> [03:12] it never touched the buffer
<thesjg!~sjgirc@67-54-133-153.cust.wildblue.net> [03:13] how do you know if its all zero's, in an efficient fashion

thesjg

KEVENT SUBSYSTEM REFACTOR DESIGN DOCUMENT

/*
 * Drivers and etc. will only expose an event filter now, instead of
 * attach/detach/event filters. One filter function each is exposed for read,
 * write, except, etc (instead of 3 each).
 *
 * A new kq api will be exposed for drivers to hook themselves into kq at
 * initialization time, they will provide flags (such as whether they are mpsafe
 * or not), some opaque private data (a hook) and a function pointer. The driver

thesjg

/*
 * Used to maintain information about processes that wish to be
 * notified when I/O becomes possible.
 */
struct kev_filter {
        struct  kev_filter_entry_list   kf_entry;
        struct  kev_filter_ops          kf_ops;
        caddr_t                         fo_hook;
};

thesjg

/*
 * Needs a tile layer, something like (for Leaflet) ..
 * 
 * var tl = L.tileLayer("content://com.pahasapatrails.m.tiles/{style}/{z}/{x}/{y}.png",
 *     { style: "XXX", minZoom: 9, maxZoom: 13, tms: true });
 * map.addLayer(tl);
 *
 * 
 * Also needs a provider entry under the application tag in the Android
 * Manifest, something like the following ..