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Mon, 15 Jul 2024 16:00:42 +0000 Date: Mon, 15 Jul 2024 18:00:30 +0200 From: Cyril Hrubis To: Andrea Cervesato Message-ID: References: <20240516104227.25381-1-andrea.cervesato@suse.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 3DF321F82C X-Rspamd-Action: no action X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Spamd-Result: default: False [-0.01 / 50.00]; MID_RHS_NOT_FQDN(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_TLS_ALL(0.00)[]; MIME_TRACE(0.00)[0:+]; MISSING_XM_UA(0.00)[]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; TO_DN_SOME(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; FUZZY_BLOCKED(0.00)[rspamd.com]; RCPT_COUNT_THREE(0.00)[3]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns,suse.cz:dkim,suse.cz:email]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; DKIM_TRACE(0.00)[suse.cz:+] X-Spamd-Bar: / X-Virus-Scanned: clamav-milter 1.0.3 at in-6.smtp.seeweb.it X-Virus-Status: Clean Subject: Re: [LTP] [PATCH v1 0/3] cachestat testing suite X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ltp@lists.linux.it Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Hi! > > I had to go through the cachestat code and maybe i found the solution. I > > will send the tests soon. > > I had a look as well and it looks that cachestat should work fine for > all file descriptors that can be mmaped(). So as long as you get success > for a file descriptor that returns EBADF for mmap() it shouldn't > probably work with cachestat() either. And after more staring at the kernel sources I've found that: - anonymous inodes have the page cache mappings initialized to zeros and empty list - this is not used for anything for most types of file descriptors (e.g. sockets) So if you call cacestat() on a socket fd it will try to loop over empty list of vmas and the end result would be statistics that are full of zeroes. Maybe that is worth of a special test just for this case. -- Cyril Hrubis chrubis@suse.cz -- Mailing list info: https://lists.linux.it/listinfo/ltp