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* samsung update 1codeworkx2012-06-021-0/+25
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* [CPUFREQ] Don't set stat->last_index to -1 if the pol->cur has incorrect value.Konrad Rzeszutek Wilk2011-06-161-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If the driver submitted an non-existing pol>cur value (say it used the default initialized value of zero), when the cpufreq stats tries to setup its initial values it incorrectly sets stat->last_index to -1 (or 0xfffff...). And cpufreq_stats_update tries to update at that index location and fails. This can be caused by: stat->last_index = freq_table_get_index(stat, policy->cur); not finding the appropiate frequency in the table (b/c the policy->cur is wrong) and we end up crashing. The fix however is concentrated in the 'cpufreq_stats_update' as the last_index (and old_index) are updated there. Which means it can reset the last_index to -1 again and on the next iteration cause a crash. Without this patch, the following crash is observed: powernow-k8: Found 1 AMD Athlon(tm) 64 Processor 3700+ (1 cpu cores) (version 2.20.00) powernow-k8: fid 0x2 (1000 MHz), vid 0x12 powernow-k8: fid 0xa (1800 MHz), vid 0xa powernow-k8: fid 0xc (2000 MHz), vid 0x8 powernow-k8: fid 0xe (2200 MHz), vid 0x8 Marking TSC unstable due to cpufreq changes powernow-k8: fid trans failed, fid 0x2, curr 0x0 BUG: unable to handle kernel paging request at ffff880807e07b78 IP: [<ffffffff81479163>] cpufreq_stats_update+0x46/0x5b .. snip.. Pid: 1, comm: swapper Not tainted 3.0.0-rc2 #45 MICRO-STAR INTERNATIONAL CO., LTD MS-7094/MS-7094 ..snip.. Call Trace: [<ffffffff81479248>] cpufreq_stat_notifier_trans+0x48/0x7c [<ffffffff81095d68>] notifier_call_chain+0x32/0x5e [<ffffffff81095e6b>] __srcu_notifier_call_chain+0x47/0x63 [<ffffffff81095e96>] srcu_notifier_call_chain+0xf/0x11 [<ffffffff81477e7a>] cpufreq_notify_transition+0x111/0x134 [<ffffffff8147b0d4>] powernowk8_target+0x53b/0x617 [<ffffffff8147723a>] __cpufreq_driver_target+0x2e/0x30 [<ffffffff8147a127>] cpufreq_governor_dbs+0x339/0x356 [<ffffffff81477394>] __cpufreq_governor+0xa8/0xe9 [<ffffffff81477525>] __cpufreq_set_policy+0x132/0x13e [<ffffffff8147848d>] cpufreq_add_dev_interface+0x272/0x28c Reported-by: Tobias Diedrich <ranma+xen@tdiedrich.de> Tested-by: Tobias Diedrich <ranma+xen@tdiedrich.de> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] Remove cpufreq_stats sysfs entries on module unload.Dave Jones2011-06-121-0/+1
| | | | | | | | | cpufreq_stats leaves behind its sysfs entries, which causes a panic when something stumbled across them. (Discovered by unloading cpufreq_stats while powertop was loaded). Signed-off-by: Dave Jones <davej@redhat.com> Cc: stable@kernel.org
* [CPUFREQ] cpufreq_stats.c: Fixed brace coding style issueKarthigan Srinivasan2011-05-041-2/+1
| | | | | | | Fixed brace coding style issue. Signed-off-by: Karthigan Srinivasan <karthigan.srinivasan@hp.com> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] Fix memory leak in cpufreq_statsteven finney2011-05-041-3/+18
| | | | | | | | | | | | | | When a CPU is taken offline in an SMP system, cpufreq_remove_dev() nulls out the per-cpu policy before cpufreq_stats_free_table() can make use of it. cpufreq_stats_free_table() then skips the call to sysfs_remove_group(), leaving about 100 bytes of sysfs-related memory unclaimed each time a CPU-removal occurs. Break up cpu_stats_free_table into sysfs and table portions, and call the sysfs portion early. Signed-off-by: Steven Finney <steven.finney@palm.com> Signed-off-by: Dave Jones <davej@redhat.com> Cc: stable@kernel.org
* include cleanup: Update gfp.h and slab.h includes to prepare for breaking ↵Tejun Heo2010-03-301-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
* [CPUFREQ] checkpatch cleanups for cpufreq_statsDave Jones2009-02-241-39/+35
| | | | Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] change cpu freq arrays to per_cpu variablesMike Travis2008-05-191-12/+12
| | | | | | | | | | | | | | Change cpufreq_policy and cpufreq_governor pointer tables from arrays to per_cpu variables in the cpufreq subsystem. Also some minor complaints from checkpatch.pl fixed. Based on: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86.git Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] state info wrong after resumeShaohua Li2008-04-281-1/+1
| | | | | | | | | | | Sometimes old_index != stat->last_index, see cpufreq_update_policy, bios can change cpu setting in resume. In my test, after resume cpu is in lowest speed, but the stat info shows cpu is in full speed. This patch makes the stat info correct after a resume. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] fix show_trans_tableCesar Eduardo Barros2008-04-281-1/+5
| | | | | | | | | | | | Fix show_trans_table when it overflows PAGE_SIZE. * Not all snprintf calls were protected against being passed a negative length. * When show_trans_table overflows, len might be > PAGE_SIZE. In that case, returns PAGE_SIZE. Signed-off-by: Cesar Eduardo Barros <cesarb@cesarb.net> Signed-off-by: Dave Jones <davej@codemonkey.org.uk>
* [CPUFREQ] fix section mismatch warningsSam Ravnborg2008-03-051-1/+1
| | | | | | | | | | | | | | | | | | Fix the following warnings: WARNING: vmlinux.o(.text+0xfe6711): Section mismatch in reference from the function cpufreq_unregister_driver() to the variable .cpuinit.data:cpufreq_cpu_notifier WARNING: vmlinux.o(.text+0xfe68af): Section mismatch in reference from the function cpufreq_register_driver() to the variable .cpuinit.data:cpufreq_cpu_notifier WARNING: vmlinux.o(.exit.text+0xc4fa): Section mismatch in reference from the function cpufreq_stats_exit() to the variable .cpuinit.data:cpufreq_stat_cpu_notifier The warnings were casued by references to unregister_hotcpu_notifier() from normal functions or exit functions. This is flagged by modpost as a potential error because it does not know that for the non HOTPLUG_CPU scenario the unregister_hotcpu_notifier() is a nop. Silence the warning by replacing the __initdata annotation with a __refdata annotation. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Dave Jones <davej@codemonkey.org.uk>
* drivers/cpufreq/cpufreq_stats.c section fixAdrian Bunk2007-12-171-1/+1
| | | | | | | | | | | | | | | | | cpufreq_stats_free_table() mustn't be __cpuexit since it's called by the __cpuinit cpufreq_stat_cpu_callback(). This patch fixes the following section mismatch reported by Chris Clayton: WARNING: vmlinux.o(.init.text+0x143dd): Section mismatch: reference to .exit.text:cpufreq_stats_free_table (between 'cpufreq_stat_cpu_callback' and 'cpufreq_stats_init') Signed-off-by: Adrian Bunk <bunk@kernel.org> Cc: Chris Clayton <chris2553@googlemail.com> Acked-by: Dave Jones <davej@codemonkey.org.uk> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [CPUFREQ] cpufreq_stats: misc cpuinit section annotationsSatyam Sharma2007-10-041-10/+8
| | | | | | | | | | | | | | | | | | * Stop referencing the callback directly from the __init and __exit functions of this driver, and instead explicitly call cpufreq_update_policy() et al. This enables the callback function to be marked as __cpuinit (and the notifier_block __cpuinitdata), thereby saving space when HOTPLUG_CPU=n. This also enables us to use other tricks to replace __cpuinit{data} in future. * cpufreq_stats_free_table() is only called from __cpuinit or __exit marked functions, making it an ideal candidate for __cpuexit. * Fix missing space in the module description Signed-off-by: Satyam Sharma <satyam@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dave Jones <davej@redhat.com>
* sysfs: kill unnecessary attribute->ownerTejun Heo2007-07-111-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | sysfs is now completely out of driver/module lifetime game. After deletion, a sysfs node doesn't access anything outside sysfs proper, so there's no reason to hold onto the attribute owners. Note that often the wrong modules were accounted for as owners leading to accessing removed modules. This patch kills now unnecessary attribute->owner. Note that with this change, userland holding a sysfs node does not prevent the backing module from being unloaded. For more info regarding lifetime rule cleanup, please read the following message. http://article.gmane.org/gmane.linux.kernel/510293 (tweaked by Greg to not delete the field just yet, to make it easier to merge things properly.) Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* Add suspend-related notifications for CPU hotplugRafael J. Wysocki2007-05-091-0/+2
| | | | | | | | | | | | | | | | | | | | | Since nonboot CPUs are now disabled after tasks and devices have been frozen and the CPU hotplug infrastructure is used for this purpose, we need special CPU hotplug notifications that will help the CPU-hotplug-aware subsystems distinguish normal CPU hotplug events from CPU hotplug events related to a system-wide suspend or resume operation in progress. This patch introduces such notifications and causes them to be used during suspend and resume transitions. It also changes all of the CPU-hotplug-aware subsystems to take these notifications into consideration (for now they are handled in the same way as the corresponding "normal" ones). [oleg@tv-sign.ru: cleanups] Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Cc: Gautham R Shenoy <ego@in.ibm.com> Cc: Pavel Machek <pavel@ucw.cz> Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [CPUFREQ] Remove hotplug cpu crapDave Jones2007-02-101-2/+0
| | | | | | | | | The hotplug CPU locking in cpufreq is horrendous. No-one seems to care enough to fix it, so just remove it so that the 99.9% of the real world users of this code can use cpufreq without being bothered by warnings. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] Bug fix for acpi-cpufreq and cpufreq_stats oops on frequency ↵Venkatesh Pallipadi2006-12-221-0/+4
| | | | | | | | | | | | | | | | | | | | | change notification Fixes the oops in cpufreq_stats with acpi_cpufreq driver. The issue was that the frequency was reported as 0 in acpi-cpufreq.c. The bug is due to different indicies for freq_table and ACPI perf table. Also adds a check in cpufreq_stats to check for error return from freq_table_get_index() and avoid using the error return value. Patch fixes the issue reported at http://www.ussg.iu.edu/hypermail/linux/kernel/0611.2/0629.html and also other similar issue here http://bugme.osdl.org/show_bug.cgi?id=7383 comment 53 Signed-off-by: Dhaval Giani <dhaval.giani@gmail.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] Fix coding style issues in cpufreq.Gautham R Shenoy2006-11-061-5/+6
| | | | | | | | Clean up cpufreq subsystem to fix coding style issues and to improve the readability. Signed-off-by: Gautham R Shenoy <ego@in.ibm.com> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] Fix some more CPU hotplug locking.Dave Jones2006-09-221-2/+0
| | | | | | | | | | | | | | | | | | | | | | | Lukewarm IQ detected in hotplug locking BUG: warning at kernel/cpu.c:38/lock_cpu_hotplug() [<b0134a42>] lock_cpu_hotplug+0x42/0x65 [<b02f8af1>] cpufreq_update_policy+0x25/0xad [<b0358756>] kprobe_flush_task+0x18/0x40 [<b0355aab>] schedule+0x63f/0x68b [<b01377c2>] __link_module+0x0/0x1f [<b0119e7d>] __cond_resched+0x16/0x34 [<b03560bf>] cond_resched+0x26/0x31 [<b0355b0e>] wait_for_completion+0x17/0xb1 [<f965c547>] cpufreq_stat_cpu_callback+0x13/0x20 [cpufreq_stats] [<f9670074>] cpufreq_stats_init+0x74/0x8b [cpufreq_stats] [<b0137872>] sys_init_module+0x91/0x174 [<b0102c81>] sysenter_past_esp+0x56/0x79 As there are other places that call cpufreq_update_policy without the hotplug lock, it seems better to keep the hotplug locking at the lower level for the time being until this is revamped. Signed-off-by: Dave Jones <davej@redhat.com>
* Remove obsolete #include <linux/config.h>Jörn Engel2006-06-301-1/+0
| | | | | Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
* [PATCH] cpu hotplug: make [un]register_cpu_notifier init time onlyChandra Seetharaman2006-06-271-2/+2
| | | | | | | | | | | | | | | | CPUs come online only at init time (unless CONFIG_HOTPLUG_CPU is defined). So, cpu_notifier functionality need to be available only at init time. This patch makes register_cpu_notifier() available only at init time, unless CONFIG_HOTPLUG_CPU is defined. This patch exports register_cpu_notifier() and unregister_cpu_notifier() only if CONFIG_HOTPLUG_CPU is defined. Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Cc: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [CPUFREQ] CodingStyle nits in cpufreq_stats.cDave Jones2006-05-301-3/+3
| | | | Signed-off-by: Dave Jones <davej@redhat.com>
* [PATCH] cpufreq: fix section mismatch warningsSam Ravnborg2006-03-111-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | cpufreq are the only remaining bit to be solved for me to have a modpost clean build for sparc64 - so I took one more look at it. changelog entry: Fix section mismatch warnings in cpufreq: WARNING: drivers/cpufreq/cpufreq_stats.o - Section mismatch: reference to .init.text: from .data between 'cpufreq_stat_cpu_notifier' (at offset 0xa8) and 'notifier_policy_block' WARNING: drivers/cpufreq/cpufreq_stats.o - Section mismatch: reference to .init.text: from .exit.text after 'cleanup_module' (at offset 0x30) The culprint is the function: cpufreq_stat_cpu_callback It is marked __cpuinit which get's redefined to __init in case HOTPLUG_CPU is not enabled as per. init.h: #ifdef CONFIG_HOTPLUG_CPU #define __cpuinit #else #define __cpuinit __init #endif $> grep HOTPLUG .config CONFIG_HOTPLUG=y But cpufreq_stat_cpu_callback() is used in: __exit cpufreq_stats_exit() static struct notifier_block cpufreq_stat_cpu_notifier cpufreq_stat_cpu_notifier is again used in: __init cpufreq_stats_init() __exit cpufreq_stats_exit() So in both cases used from both __init and __exit context. Only solution seems to drop __cpuinit tag. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] Lots of whitespace & CodingStyle cleanup.Dave Jones2006-02-281-3/+3
| | | | Signed-off-by: Dave Jones <davej@redhat.com>
* Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreqLinus Torvalds2005-11-071-4/+8
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| * [CPUFREQ] Fix up compile of cpufreq_statsDave Jones2005-11-011-0/+1
| | | | | | | | | | | | Whoops, I lost a hunk of the last patch somehow. Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] Check return value of cpufreq_cpu_get in cpufreq_statsDave Jones2005-10-271-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This fixes an issue found in drivers/cpufreq/cpufreq_stats.c by Coverity. Error reported: CID: 2642 Checker: NULL_RETURNS (help) File: /export2/p4-coverity/mc2/linux26/drivers/cpufreq/cpufreq_stats.c Function: cpufreq_stats_create_table Description: Dereferencing NULL value "data" Patch description: The return of cpufreq_cpu_get can be NULL, check return code and return -EINVAL if it is NULL. Signed-off-by: Jayachandran C. <c.jayachandran at gmail.com> Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] kzalloc conversions for cpufreq core.Dave Jones2005-10-201-4/+2
| | | | | | | | Signed-off-by: Dave Jones <davej@redhat.com>
* | [PATCH] create and destroy cpufreq sysfs entries based on cpu notifiersAshok Raj2005-10-301-4/+38
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | cpufreq entries in sysfs should only be populated when CPU is online state. When we either boot with maxcpus=x and then boot the other cpus by echoing to sysfs online file, these entries should be created and destroyed when CPU_DEAD is notified. Same treatement as cache entries under sysfs. We place the processor in the lowest frequency, so hw managed P-State transitions can still work on the other threads to save power. Primary goal was to just make these directories appear/disapper dynamically. There is one in this patch i had to do, which i really dont like myself but probably best if someone handling the cpufreq infrastructure could give this code right treatment if this is not acceptable. I guess its probably good for the first cut. - Converting lock_cpu_hotplug()/unlock_cpu_hotplug() to disable/enable preempt. The locking was smack in the middle of the notification path, when the hotplug is already holding the lock. I tried another solution to avoid this so avoid taking locks if we know we are from notification path. The solution was getting very ugly and i decided this was probably good for this iteration until someone who understands cpufreq could do a better job than me. (akpm: export cpucontrol to GPL modules: drivers/cpufreq/cpufreq_stats.c now does lock_cpu_hotplug()) Signed-off-by: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: Dave Jones <davej@codemonkey.org.uk> Cc: Zwane Mwaikambo <zwane@holomorphy.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] cpufreq-stats driver updatesVenkatesh Pallipadi2005-05-311-17/+30
| | | | | | | | | | | Changes to the cpufreq stats driver: * Changes the way P-state transition table looks in /sysfs providing more clear output * Changes the time unit in the output from HZ to clock_t Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
* Linux-2.6.12-rc2Linus Torvalds2005-04-161-0/+334
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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