On 10/21/2012 08:51 AM, Junio C Hamano wrote:
> Michael Haggerty <mhagger@xxxxxxxxxxxx> writes:
>
>> This patch series has the side effect that all of the directories
>> listed in GIT_CEILING_DIRECTORIES are accessed *unconditionally* to
>> resolve any symlinks that are present in their paths. It is
>> admittedly odd that a feature intended to avoid accessing expensive
>> directories would now *intentionally* access directories near the
>> expensive ones. In the above scenario this shouldn't be a problem,
>> because /home would be the directory listed in
>> GIT_CEILING_DIRECTORIES, and accessing /home itself shouldn't be
>> expensive.
>
> Interesting observation. In the last sentence, "accessing /home"
> does not exactly mean accessing /home, but accessing / to learn
> about "home" in it, no?
This is the extra overhead on my system for using
GIT_CEILING_DIRECTORIES=/home:
stat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
getcwd("/home/mhagger", 1024) = 14
chdir("/home") = 0
getcwd("/home", 4096) = 6
lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
chdir("/home/mhagger") = 0
If I use GIT_CEILING_DIRECTORIES=/dev/shm, which is a symlink to
/run/shm on my system, the overhead is comparable:
stat("/dev/shm", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=200, ...}) = 0
getcwd("/home/mhagger", 1024) = 14
chdir("/dev/shm") = 0
getcwd("/run/shm", 4096) = 9
lstat("/run/shm", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=200, ...}) = 0
chdir("/home/mhagger") = 0
Michael
--
Michael Haggerty
mhagger@xxxxxxxxxxxx
http://softwareswirl.blogspot.com/
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