[PATCH v4 0/4] xentop: add physical CPU usage support

[Jahan Murudi <jahan.murudi.zg@xxxxxxxxxxx>]

This is v4 of the patch series to add physical CPU monitoring to xentop.

Changes since v3:
-   Split the single large patch into a logical series of 3 smaller patches
    for easier review.
-   Fixed the memory allocation error handling in pcpu.c as pointed out by
    Anthony PERARD. The realloc() result is now assigned immediately to avoid
    invalid pointers on failure.
-   Simplified the time calculation by using a single global timestamp instead
    of a per-CPU array, as the time difference is the same for all cores.
-   Removed the unnecessary check for small time intervals which could lead to
    incorrect usage calculations.
-   Integrated the PCPU display with the existing print() function to ensure
    correct behavior in both interactive and batch modes.

The series adds a new '-p'/'--pcpus' flag to xentop. When enabled, it displays
a table showing the usage percentage of each physical CPU core in the system.

Jahan Murudi (4):
  xentop: add pcpu header and basic infrastructure
  xentop: add pcpu implementation with proper error handling
  xentop: update Makefile to link against libxenctrl
  xentop: integrate pcpu support into main program


 tools/xentop/Makefile |   5 +-
 tools/xentop/pcpu.c   | 141 ++++++++++++++++++++++++++++++++++++++++++
 tools/xentop/pcpu.h   |  17 +++++
 tools/xentop/xentop.c |  79 +++++++++++++++++------
 4 files changed, 222 insertions(+), 20 deletions(-)
 create mode 100644 tools/xentop/pcpu.c
 create mode 100644 tools/xentop/pcpu.h

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2.34.1