Date: Wed, 26 Dec 2012 15:32:04 +0800 (SGT) From: Patrick Dung <patrick_dkt@yahoo.com.hk> To: Eitan Adler <lists@eitanadler.com>, Konstantin Belousov <kostikbel@gmail.com> Cc: freebsd hackers <freebsd-hackers@freebsd.org>, fs@freebsd.org Subject: Re: About QUOTA support in stock kernel (resent) Message-ID: <1356507124.60133.YahooMailClassic@web190803.mail.sg3.yahoo.com> In-Reply-To: <20121225152905.GB82219@kib.kiev.ua>
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I am curious if other operating systems have this performance impact. Could we have some workaround or need some code improvement? For example: Do the checking/accounting only if the specific mount point has enabled quota. etc.. Regards, Patrick --- On Tue, 12/25/12, Konstantin Belousov <kostikbel@gmail.com> wrote: From: Konstantin Belousov <kostikbel@gmail.com> Subject: Re: About QUOTA support in stock kernel (resent) To: "Eitan Adler" <lists@eitanadler.com> Cc: "Patrick Dung" <patrick_dkt@yahoo.com.hk>, "freebsd hackers" <freebsd-hackers@freebsd.org>, fs@freebsd.org Date: Tuesday, December 25, 2012, 11:29 PM On Tue, Dec 25, 2012 at 10:23:26AM -0500, Eitan Adler wrote: > On 25 December 2012 10:07, Konstantin Belousov <kostikbel@gmail.com> wrote: > > Enabling quota by default would cause small overhead, like one mutex acquire, > > for each inode and block alloc/dealloc, even for mount without quotas enabled. > > Why is this, and can it be avoided (for mounts without quotas)? Because system should check whether quota is enabled to do the accounting. > > > Might be, it is reasonable to just enable it now. Unless somebody provide > > valid objections and I do not forget, I will do it in a week for HEAD. > > > > -- > Eitan Adler
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