X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=man%2Fsd_readahead.xml;h=88b135b7ecd4acc035e1d6863c677c7f148d42a6;hp=178f907afa95bde3b28d7a62953d7b4d94472a8f;hb=71e6c1cf47c35cc5a58cefaabe4f6848d6f09501;hpb=6624768c9c39ab409edebe07cb06ecd93cc6f3ed diff --git a/man/sd_readahead.xml b/man/sd_readahead.xml index 178f907af..88b135b7e 100644 --- a/man/sd_readahead.xml +++ b/man/sd_readahead.xml @@ -44,7 +44,7 @@ sd_readahead - Control ongoing disk read-ahead operations + Control ongoing disk boot-time read-ahead operations @@ -62,7 +62,7 @@ Description sd_readahead() may be called by programs involved with early boot-up to - control ongoing disk read-ahead operations. It may be + control ongoing boot-time disk read-ahead operations. It may be used to terminate read-ahead operations in case an uncommon disk access pattern is to be expected and hence read-ahead replay or collection is unlikely to @@ -115,36 +115,42 @@ Notes This function is provided by the reference - implementation of APIs for new-style daemons and - distributed with the systemd package. The algorithm - it implements is simple, and can easily be - reimplemented in daemons if it is important to support - this interface without using the reference - implementation. + implementation of APIs for controlling boot-time + read-ahead and distributed with the systemd + package. The algorithm it implements is simple, and + can easily be reimplemented in daemons if it is + important to support this interface without using the + reference implementation. Internally, this function creates a file in - /dev/.systemd/readahead/ which is + /run/systemd/readahead/ which is then used as flag file to notify the read-ahead subsystem. For details about the algorithm check the liberally licensed reference implementation sources: - + resp. + url="http://cgit.freedesktop.org/systemd/tree/src/sd-readahead.h"/> sd_readahead() is - implemented in the reference implementation's drop-in - sd-daemon.c and - sd-daemon.h files. It is - recommended that applications consuming this API copy - the implementation into their source tree. For more - details about the reference implementation see - sd_daemon7 - - If -DDISABLE_SYSTEMD is set during compilation - this function will always return 0 and otherwise - become a NOP. + implemented in the reference implementation's + sd-readahead.c and + sd-readahead.h files. These + interfaces are available as shared library, which can + be compiled and linked to with the + libsystemd-daemon + pkg-config1 + file. Alternatively, applications consuming this API + may copy the implementation into their source + tree. For more details about the reference + implementation see + sd-readahead7. + + If the reference implementation is used as + drop-in files and -DDISABLE_SYSTEMD is set during + compilation this function will always return 0 and + otherwise become a NOP. @@ -170,7 +176,7 @@ sd_readahead("noreplay"); See Also systemd1, - sd_daemon7, + sd-readahead7, daemon7