Compare the return value of sscanf(3) and fscanf(3) explicitly against
the expected number of parsed items and avoid implicit boolean
conversion. Such an implicit conversion would treat EOF (-1) the same
as at least one item parsed successfully.
Reported by CodeQL.
Make it more clear the variable stores the previous tty number (similar
to lasttimes), while the current one gets set in the intermediate
LinuxProcessTable_readStatFile().
Shared memory is less available than buffers, so move it
left next to used memory.
This is in preparation for including shared memory in the
basic "in use" for the bar text. It would not make sense
to sum a discontiguous region.
Coverity scanning shows we end up passing an integer into the
Row_setPidColumnWidth routine which requires a pid_t - update
each platform to return the correct type (and never return -1
as a failure code, this was being ignored).
Following up with some discusson from a few months back,
where it was proposed that ProcessTable is a better name.
This data structure is definitely not a list ... if it
was one-dimensional it'd be a set, but in practice it has
much more in common with a two-dimensional table.
The Process table is a familiar operating system concept
for many people too so it resonates a little in that way
as well.
This implements our concept of 'dynamic screens' in htop, with a
first use-case of pcp-htop displaying things like top-filesystem
and top-cgroups under new screen tabs. However the idea is more
general than use in pcp-htop and we've paved the way here for us
to collectively build mroe general tabular screens in core htop,
as well.
From the pcp-htop side of things, dynamic screens are configured
using text-based configuration files that define the mapping for
PCP metrics to columns (and metric instances to rows). Metrics
are defined either directly (via metric names) or indirectly via
PCP derived metric specifications. Value scaling and the units
displayed is automatic based on PCP metric units and data types.
This commit represents a collaborative effort of several months,
primarily between myself, Nathan and BenBE.
Signed-off-by: Sohaib Mohamed <sohaib.amhmd@gmail.com>
Signed-off-by: Nathan Scott <nathans@redhat.com>
This commit refactors the Process and ProcessList structures such
they each have a new parent - Row and Table, respectively. These
new classes handle screen updates relating to anything that could
be represented in tabular format, e.g. cgroups, filesystems, etc,
without us having to reimplement the display logic repeatedly for
each new entity.
The 'comprisedValues' boolean property unnecessarily complicates the
drawing algorithms of Bar meters and Graph meters. Since the only user
of 'comprisedValues' is ZramMeter, it is better to rework the meter so
that it no longer needs 'comprisedValues'.
The 'values[ZRAM_METER_UNCOMPRESSED]' now stores the difference between
uncompressed and compressed data size.
Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
The SPACESHIP_NUMBER() macro does not work well with floating point
values that are possible to be NaNs. Change the compare logic of all
percentage fields of Process entries to use compareRealNumbers().
Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
The standard isnan() function is defined to never throw FP exceptions
even when the argument is a "signaling" NaN. This makes isnan() more
expensive than (x != x) expression unless the compiler flag
'-fno-signaling-nans' is given.
Introduce functions isNaN(), isNonnegative(), isPositive(),
sumPositiveValues() and compareRealNumbers(), and replace isnan() in
htop's codebase with the new functions. These functions utilize
isgreater() and isgreaterequal() comparisons, which do not throw FP
exceptions on "quiet" NaNs, which htop uses extensively.
With isnan() removed, there is no need to suppress the warning
'-Wno-c11-extensions' in FreeBSD. Remove the code from 'configure.ac'.
Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
* Use saturatingSub() when subtracting CPU time and I/O read/write
bytes of processes so that the values would never go negative (causing unsigned integer wraparound).
* The CPU percentages of processes are now NaN if the time interval
between measures (the "delta time") is zero. Make the conditional
explicit and avoid division by zero. Previously the percentage values
would be 0.0.
Note: The saturatingSub() function is not used in cpu_delay_percent,
blkio_delay_percent and swapin_delay_percent with a comment added that
explains the reason.
Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
The recent split of machine-wide metric gathering from process metrics
gathering introduced a regression in the Linux running task accounting.
The way we extract this value from /proc/stat (which typically is used
for machine-wide metrics) conspired with a now-incorrectly placed init-
to-zero at the start of the per-process sampling, caused this value to
always be zero by the time the Tasks Meter used it.
Fix this by making it much more clear that Linux has this special case
handling of runningTasks.
Resolves#1256
First stage in sanitizing the process list structure so that htop
can support other types of lists too (cgroups, filesystems, ...),
in the not-too-distant future.
This introduces struct Machine for system-wide information while
keeping process-list information in ProcessList (now much less).
Next step is to propogate this separation into each platform, to
match these core changes.
For now, the semantics are mostly fit for Linux zswap subsystem. For
instance, we add the third swap usage metric that indicates the amount
of memory that is accounted to swap but in fact stored elsewhere. This
exactly matches the definition of frontswap/zswap, and is probably of
little use to all other platforms.
Benny Baumann
Christian Göttsche
Daniel Lange
Nathan Scott
BowDown097
BowDown097
Kevin Bracey
Sohaib Mohamed
Explorer09
lestermfp
Ivan Shapovalov