From: John Reiser <jreiser@bitwagon.com>
To: linux-mm@kvack.org
Subject: msync() seems not to clean the data cache
Date: Fri, 25 Apr 2025 12:17:37 -0700 [thread overview]
Message-ID: <9a70a70d-9dce-46a0-997e-b8a346e60902@bitwagon.com> (raw)
The system call write() cleans the hardware data cache (writes any dirty
values from the data cache into RAM memory) before passing to the VFS
the region to be written. The system call msync() should do likewise.
Currently msync() does not clean the hardware data cache, as seen on
PowerPC, PowerPC64, and arm64; and probably any CPU that does not
have a Write-through cache. (x86 and x86_64 do have write-through.)
Please fix system call msync() so that it cleans the hardware data cache
first.
next reply other threads:[~2025-04-25 19:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-25 19:17 John Reiser [this message]
2025-04-25 19:31 ` Matthew Wilcox
2025-04-25 20:45 ` John Reiser
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