Date: Fri, 11 Apr 2008 22:44:55 -0600 From: Scott Long <scottl@samsco.org> To: Julian Elischer <julian@elischer.org> Cc: FreeBSD Current <current@freebsd.org> Subject: Re: stack hogs in kernel Message-ID: <48003E47.4090006@samsco.org> In-Reply-To: <48002444.4030505@elischer.org> References: <48002444.4030505@elischer.org>
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Julian Elischer wrote: > > A few years ago I took a profile of stack hogs in the kernel. > I just redid the exercise... > > http://people.freebsd.org/~julian/stack-hogs.txt > > > the worst offenders in MY (2 month old) kernel are: > > 0xc05667e3 kldstat [kernel]: 2100 > 0xc07214f8 sendsig [kernel]: 1416 > 0xc04fb426 ugenread [kernel]: 1200 > 0xc070616b ipmi_smbios_identify [kernel]: 1136 > 0xc050bd26 usbd_new_device [kernel]: 1128 > 0xc0525a83 pfs_readlink [kernel]: 1092 > 0xc04fb407 ugenwrite [kernel]: 1056 > 0xc055ea33 prison_enforce_statfs [kernel]: 1044 > 0xc0686e8a nfsrv_rename [kernel]: 984 > 0xc05d0886 m_copymdata [kernel]: 956 > 0xc06605a3 nfs4_mount [kernel]: 884 > 0xc0561e25 kse_switchin [kernel]: 848 > 0xc0680ac6 nfsrv_statfs [kernel]: 828 > 0xc0439473 cam_periph_error [kernel]: 820 > 0xc071ff36 sigreturn [kernel]: 812 > 0xc067e876 nfsrv_fsinfo [kernel]: 804 > 0xc05fe7b3 freebsd4_fhstatfs [kernel]: 804 > 0xc0571272 sysctl_out_proc [kernel]: 804 > 0xc067ebf7 nfsrv_fsinfo [kernel]: 804 > 0xc0571006 sysctl_out_proc [kernel]: 804 > 0xc044b743 cddone [kernel]: 800 > 0xc06862cf nfsrv_link [kernel]: 796 I'll take a look at cddone(). I see where the problem is, but it's hard to fix correctly. However, the call chain leading to and from cddone is pretty small and unlikely to recurse; I seriously doubt that it will cause problems. Scott
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