Date: Thu, 30 Sep 2021 21:59:17 GMT From: Colin Percival <cperciva@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: ce73f768b764 - main - EFI loader: Don't free bcache for DEVT_DISK devs Message-ID: <202109302159.18ULxH0H081953@gitrepo.freebsd.org>
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The branch main has been updated by cperciva: URL: https://cgit.FreeBSD.org/src/commit/?id=ce73f768b76486b1562f207a6fc1cef87065418a commit ce73f768b76486b1562f207a6fc1cef87065418a Author: Colin Percival <cperciva@FreeBSD.org> AuthorDate: 2021-09-30 21:48:14 +0000 Commit: Colin Percival <cperciva@FreeBSD.org> CommitDate: 2021-09-30 21:48:14 +0000 EFI loader: Don't free bcache for DEVT_DISK devs Booting on an EC2 c5.xlarge instance, this reduces the number of I/Os performed from 609 to 432, reduces the total number of blocks read from 61963 to 60797, and reduces the time spent in the loader by 39 ms. Note that b4cb3fe0e39a allowed the bcache to be retained for most of the boot process, but relies on mounting filesystems; this commit allows the bcache to be retained at the start of the boot process, before the root filesystem has been located. Reviewed by: imp, tsoome MFC after: 1 week Sponsored by: https://www.patreon.com/cperciva Differential Revision: https://reviews.freebsd.org/D32239 --- stand/efi/libefi/efipart.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/stand/efi/libefi/efipart.c b/stand/efi/libefi/efipart.c index aede28ef40c3..7807c17077a6 100644 --- a/stand/efi/libefi/efipart.c +++ b/stand/efi/libefi/efipart.c @@ -949,8 +949,10 @@ efipart_close(struct open_file *f) pd->pd_open--; if (pd->pd_open == 0) { pd->pd_blkio = NULL; - bcache_free(pd->pd_bcache); - pd->pd_bcache = NULL; + if (dev->dd.d_dev->dv_type != DEVT_DISK) { + bcache_free(pd->pd_bcache); + pd->pd_bcache = NULL; + } } if (dev->dd.d_dev->dv_type == DEVT_DISK) return (disk_close(dev));
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